# Placer County, California

Placer County (/ˈplæsər/ PLASS-ər; Placer, Spanish for "sand deposit"), officially the County of Placer, is a county located in the U.S. state of California. As of the 2020 United States census, the population was 404,739. The county seat is Auburn.
Placer County is included in the Greater Sacramento metropolitan area. It is in both the Sacramento Valley and Sierra Nevada regions, in what is known as the Gold Country. The county stretches roughly 65 miles (105 km) from Sacramento's suburbs at Roseville to the Nevada border and the shore of Lake Tahoe.

## Etymology

The discovery of gold in 1848 brought tens of thousands of miners from around the world during the California Gold Rush. In addition, many more thousands came to provide goods and services to the miners. On April 25, 1851, the fast-growing county was formed from parts of Sutter and Yuba Counties with Auburn as the county seat. Placer County took its name from the Spanish word for sand or gravel deposits containing gold. Miners washed away the gravel, leaving the heavier gold, in a process known as "placer mining".

## History

Gold mining was a major industry through the 1880s, but gradually the new residents turned to farming the fertile foothill soil, harvesting timber and working for the Southern Pacific Railroad. Auburn was settled when Claude Chana discovered gold in Auburn Ravine in May 1848, and it later became a shipping and supply center for the surrounding gold camps. The cornerstone of Placer's courthouse, which is clearly visible from Interstate 80 through Auburn, was laid on July 4, 1894. The building was renovated during the late 1980s and continues to serve the public with courtrooms, a sheriff's office and the Placer County Museum. Roseville, once a small agricultural center, became a major railroad center and grew to the county's most populous city after Southern Pacific Railroad moved its railroad switching yards there in 1908.
Loomis and Newcastle began as mining towns, but soon became centers of a booming fruit-growing industry, supporting many local packing houses. Penryn was founded by a Welsh miner, Griffith Griffith, who established a large granite quarry. Rocklin began as a railroad town and became home to a number of granite quarries. Lincoln and Sheridan continue to support ranching and farming. Lincoln also is the home of one of the county's oldest businesses, the Gladding, McBean terra cotta clay manufacturing plant, established in 1875.
The 1960 Winter Olympics were hosted in Squaw Valley, in Placer County.

## Geography

According to the U.S. Census Bureau, the county has an area of 1,502 square miles (3,890 km$^2$), of which 1,407 square miles (3,640 km$^2$) is land and 95 square miles (250 km$^2$) (6.4%) is water. Watercourses in Placer County include the American River and Bunch Creek. 40.96% of Lake Tahoe's surface area is in Placer County, more than in any of the four other counties in which it lies.
The county is typically divided into three regions; "South Placer" in the Central Valley and the Sierra Nevada foothills south of Auburn, "Gold Country" which consists of the Sierra Foothills around Auburn, Colfax, and Foresthill, and the Sierra Nevada which consists of all areas east of Foresthill and northeast of Colfax (including the Lake Tahoe region). Roughly 3/4ths of the population lives in South Placer, Roseville being the primary job and retail center of the county. Auburn and Lincoln are the main secondary commercial centers.

### Adjacent counties

* Nevada County - north
* Washoe County, Nevada - northeast
* Carson City, Nevada - east
* Douglas County, Nevada - southeast
* El Dorado County - south
* Sacramento County - southwest
* Sutter County - west
* Yuba County - northwest

### National protected areas

* Eldorado National Forest in part
* Tahoe National Forest in part

## Demographics
### 2020 census

Placer County, California – Racial and ethnic composition Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos may be of any race. :
| Race / Ethnicity (NH = Non-Hispanic) | Pop 2000 | Pop 2010 | Pop 2020 | % 2000 | % 2010 | % 2020 |
| White alone (NH) | 207,326 | 265,294 | 272,471 | 83.43% | 76.14% | 67.32% |
| Black or African American alone (NH) | 1,896 | 4,427 | 6,440 | 0.76% | 1.27% | 1.59% |
| Native American or Alaska Native alone (NH) | 1,687 | 2,080 | 2,010 | 0.68% | 0.60% | 0.50% |
| Asian alone (NH) | 7,148 | 19,963 | 34,776 | 2.88% | 5.73% | 8.59% |
| Pacific Islander alone (NH) | 324 | 697 | 967 | 0.13% | 0.20% | 0.24% |
| Other Race alone (NH) | 336 | 603 | 2,091 | 0.14% | 0.17% | 0.52% |
| Mixed Race or Multi-Racial (NH) | 5,753 | 10,658 | 25,356 | 2.32% | 3.06% | 6.26% |
| Hispanic or Latino (any race) | 24,019 | 44,710 | 60,628 | 9.67% | 12.83% | 14.98% |
| Total | 248,399 | 348,432 | 404,739 | 100.00% | 100.00% | 100.00% |

### 2011

Population, race, and income :
| Total population | 343,554 | 343,554 |
| White | 290,923 | 84.7% |
| Black or African American | 4,587 | 1.3% |
| American Indian or Alaska Native | 2,654 | 0.8% |
| Asian | 20,515 | 6.0% |
| Native Hawaiian or other Pacific Islander | 750 | 0.2% |
| Some other race | 11,478 | 3.3% |
| Two or more races | 12,647 | 3.7% |
| Hispanic or Latino (of any race) | 43,268 | 12.6% |
| Per capita income | $35,583 | $35,583 |
| Median household income | $74,645 | $74,645 |
| Median family income | $90,446 | $90,446 |

#### Places by population, race, and income

Places by population and race :
| Place | Type | Population | White | Other | Asian | Black or African American | Native American | Hispanic or Latino (of any race) |
| Alta | CDP | 549 | 97.6% | 2.0% | 0.0% | 0.0% | 0.4% | 9.8% |
| Auburn | City | 13,476 | 90.4% | 6.7% | 1.2% | 1.0% | 0.7% | 6.6% |
| Carnelian Bay | CDP | 289 | 100.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% |
| Colfax | City | 1,999 | 92.1% | 5.0% | 2.7% | 0.1% | 0.2% | 4.1% |
| Dollar Point | CDP | 1,091 | 98.4% | 1.6% | 0.0% | 0.1% | 0.0% | 8.9% |
| Dutch Flat | CDP | 114 | 100.0% | 0.0% | 0.0% | 0.0% | 0.0% | 3.5% |
| Foresthill | CDP | 1,823 | 84.5% | 7.2% | 2.1% | 0.0% | 6.1% | 0.6% |
| Granite Bay | CDP | 22,201 | 88.0% | 5.3% | 5.2% | 0.4% | 1.2% | 5.3% |
| Kings Beach | CDP | 3,136 | 95.7% | 2.8% | 0.0% | 0.3% | 1.2% | 61.3% |
| Kingvale ‡ | CDP | 0 | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% |
| Lincoln | City | 40,177 | 79.0% | 11.6% | 6.2% | 2.2% | 1.0% | 18.7% |
| Loomis | Town | 6,511 | 92.2% | 3.1% | 3.7% | 0.8% | 0.2% | 3.1% |
| Meadow Vista | CDP | 3,095 | 92.5% | 2.9% | 1.5% | 0.0% | 3.0% | 2.7% |
| Newcastle | CDP | 1,166 | 87.7% | 7.5% | 0.0% | 0.0% | 4.9% | 10.5% |
| North Auburn | CDP | 13,184 | 83.0% | 10.2% | 4.9% | 1.1% | 0.8% | 16.2% |
| Penryn | CDP | 665 | 99.1% | 0.0% | 0.9% | 0.0% | 0.0% | 0.0% |
| Rocklin | City | 55,713 | 83.1% | 6.0% | 8.2% | 1.7% | 1.1% | 10.5% |
| Roseville | City | 116,613 | 81.4% | 7.7% | 8.4% | 1.7% | 0.8% | 15.1% |
| Sheridan | CDP | 1,444 | 85.9% | 6.8% | 0.0% | 0.0% | 7.3% | 13.8% |
| Sunnyside-Tahoe City | CDP | 1,667 | 95.4% | 2.8% | 0.0% | 1.7% | 0.0% | 15.6% |
| Tahoe Vista | CDP | 1,376 | 86.4% | 9.4% | 4.1% | 0.0% | 0.0% | 42.5% |
| Tahoma ‡ | CDP | 361 | 100.0% | 0.0% | 0.0% | 0.0% | 0.0% | 10.2% |
| ‡ Data for Placer County area of this CDP |||||||||
Places by population and income :
| Place | Type | Population | Per capita income | Median household income | Median family income |
| Alta | CDP | 549 | $27,408 | $56,250 | $68,214 |
| Auburn | City | 13,476 | $34,471 | $62,600 | $84,679 |
| Carnelian Bay | CDP | 289 | $29,998 | $47,900 | $55,000 |
| Colfax | City | 1,999 | $27,379 | $58,750 | $70,455 |
| Dollar Point | CDP | 1,091 | $36,547 | $70,673 | $74,659 |
| Dutch Flat | CDP | 114 | $34,586 | $50,288 | $73,056 |
| Foresthill | CDP | 1,823 | $29,272 | $41,410 | $79,276 |
| Granite Bay | CDP | 22,201 | $58,548 | $126,937 | $135,578 |
| Kings Beach | CDP | 3,136 | $23,607 | $40,060 | $55,268 |
| Kingvale ‡ | CDP | 0 | | | |
| Lincoln | City | 40,177 | $33,260 | $75,071 | $83,373 |
| Loomis | Town | 6,511 | $35,922 | $86,990 | $94,966 |
| Meadow Vista | CDP | 3,095 | $35,557 | $69,709 | $88,806 |
| Newcastle | CDP | 1,166 | $24,996 | $31,736 | $49,348 |
| North Auburn | CDP | 13,184 | $25,674 | $44,107 | $51,752 |
| Penryn | CDP | 665 | $46,799 | $87,604 | $98,415 |
| Rocklin | City | 55,713 | $34,658 | $79,675 | $92,295 |
| Roseville | City | 116,613 | $34,047 | $75,245 | $92,433 |
| Sheridan | CDP | 1,444 | $24,253 | $67,813 | $81,339 |
| Sunnyside-Tahoe City | CDP | 1,667 | $32,055 | $62,470 | $85,776 |
| Tahoe Vista | CDP | 1,376 | $32,092 | $69,145 | $77,933 |
| Tahoma ‡ | CDP | 361 | $45,543 | $77,926 | $77,756 |
| ‡ Data for Placer County area of this CDP ||||||

### 2010 Census

The 2010 United States census reported that Placer County had a population of 348,432. The racial makeup of Placer County was 290,977 (83.5%) White, 4,751 (1.4%) African American, 3,011 (0.9%) Native American, 20,435 (5.9%) Asian, 778 (0.2%) Pacific Islander, 13,375 (3.8%) from other races, and 15,105 (4.3%) from two or more races. There were 4,710 Hispanics or Latinos of any race (12.8%).
Population reported at 2010 United States census :
| The County | Total Population | White | African American | Native American | Asian | Pacific Islander | other races | two or more races | Hispanic or Latino (of any race) |
| Placer County | 348,432 | 290,977 | 4,751 | 3,011 | 20,435 | 778 | 13,375 | 15,105 | 44,710 |
| Incorporated cities and towns | Total Population | White | African American | Native American | Asian | Pacific Islander | other races | two or more races | Hispanic or Latino (of any race) |
| Auburn | 13,330 | 11,863 | 100 | 129 | 240 | 9 | 405 | 584 | 1,331 |
| Colfax | 1,963 | 1,759 | 4 | 26 | 29 | 2 | 54 | 89 | 178 |
| Lincoln | 42,819 | 34,087 | 629 | 399 | 2,663 | 115 | 3,125 | 1,801 | 7,597 |
| Loomis | 6,430 | 5,733 | 33 | 74 | 169 | 12 | 149 | 260 | 568 |
| Rocklin | 56,974 | 47,047 | 858 | 410 | 4,105 | 150 | 1,538 | 2,866 | 6,555 |
| Roseville | 118,788 | 94,199 | 2,329 | 885 | 10,026 | 346 | 5,087 | 5,916 | 17,359 |
| Census-designated places | Total Population | White | African American | Native American | Asian | Pacific Islander | other races | two or more races | Hispanic or Latino (of any race) |
| Alta | 610 | 592 | 1 | 3 | 5 | 1 | 2 | 6 | 23 |
| Carnelian Bay | 524 | 493 | 1 | 4 | 14 | 0 | 1 | 11 | 13 |
| Dollar Point | 1,215 | 1,145 | 4 | 6 | 19 | 0 | 24 | 17 | 83 |
| Dutch Flat | 160 | 155 | 0 | 3 | 1 | 0 | 0 | 1 | 4 |
| Foresthill | 1,483 | 1,371 | 8 | 29 | 6 | 2 | 17 | 50 | 97 |
| Granite Bay | 20,402 | 17,960 | 148 | 138 | 1,152 | 28 | 222 | 754 | 1,260 |
| Kings Beach | 3,796 | 3,216 | 15 | 20 | 14 | 2 | 409 | 120 | 2,115 |
| Kingvale‡ | 143 | 135 | 1 | 1 | 0 | 1 | 2 | 3 | 6 |
| Meadow Vista | 3,217 | 3,017 | 1 | 21 | 35 | 6 | 34 | 103 | 171 |
| Newcastle | 1,224 | 1,113 | 7 | 19 | 17 | 0 | 35 | 33 | 104 |
| North Auburn | 13,022 | 11,081 | 115 | 172 | 298 | 13 | 893 | 450 | 2,108 |
| Penryn | 831 | 718 | 3 | 22 | 32 | 3 | 27 | 26 | 79 |
| Sheridan | 1,238 | 1,026 | 7 | 20 | 13 | 3 | 113 | 56 | 253 |
| Sunnyside-Tahoe City | 1,557 | 1,480 | 3 | 4 | 15 | 1 | 32 | 22 | 84 |
| Tahoe Vista | 1,433 | 1,279 | 3 | 8 | 21 | 2 | 82 | 38 | 352 |
| Tahoma‡ | 411 | 393 | 4 | 3 | 7 | 0 | 1 | 3 | 16 |
| Other unincorporated areas | Total Population | White | African American | Native American | Asian | Pacific Islander | other races | two or more races | Hispanic or Latino (of any race) |
| All others not CDPs (combined) | 57,003 | 51,248 | 478 | 616 | 1,554 | 83 | 1,125 | 1,899 | 4,360 |
| ‡ Note: these numbers reflect only the portion of these CDPs in Placer County ||||||||||

### 2000

As of the census of 2000, there were 248,399 people, 93,382 households, and 67,701 families residing in the county. The population density was 177 inhabitants per square mile (68/km$^2$). There were 107,302 housing units at an average density of 76 per square mile (29/km$^2$). The racial makeup of the county was 88.6% White, 0.8% Black or African American, 0.9% Native American, 3.0% Asian, 0.2% Pacific Islander, 3.4% from other races, and 3.2% from two or more races. 9.7% of the population were Hispanic or Latino of any race. 15.5% were of German, 12.3% English, 10.6% Irish, 7.1% Italian and 7.0% American ancestry according to Census 2000. 89.7% spoke only English at home; 6.0% spoke Spanish.
There were 93,382 households, out of which 35.3% had children under the age of 18 living with them, 59.4% were married couples living together, 9.2% had a female householder with no husband present, and 27.5% were non-families. 21.3% of all households were made up of individuals, and 8.1% had someone living alone who was 65 years of age or older. The average household size was 2.63 and the average family size was 3.06.
In the county, the population was spread out, with 26.5% under the age of 18, 6.9% from 18 to 24, 29.00% from 25 to 44, 24.5% from 45 to 64, and 13.1% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 96.4 males. For every 100 females age 18 and over, there were 93.9 males.
The median income for a household in the county was $57,535, and the median income for a family was $65,858 (these figures had risen to $68,463 and $80,987 respectively as of a 2007 estimate). Males had a median income of $50,410 versus $33,763 for females. The per capita income for the county was $27,963. About 3.9% of families and 5.8% of the population were below the poverty line, including 6.3% of those under age 18 and 3.8% of those age 65 or over. Unemployment in the county is just under 7% which is considerably lower than the state's average.

## Politics, government, and policing
### Government

County government is by a five-person four-year term elected board of supervisors from five single member districts with a board-appointed county manager and his/her department administrators.

### Law enforcement

The Placer County Sheriff's Office provides court protection, jail administration, and coroner services for all of Placer County. It provides patrol, detective, and other police services for the unincorporated areas of the county plus by contract to the city of Colfax and the town of Loomis.

### Politics
#### Voter registration

Population and registered voters :
| Total population | 404,739 | 404,739 |
| Registered voters | 291,479 | 72.02% |
| Democratic | 91,719 | 31.47% |
| Republican | 119,117 | 40.87% |
| Democratic–Republican spread | -27,398 | -9.40% |
| American Independent | 14,217 | 4.88% |
| Green | 1,151 | 0.39% |
| Libertarian | 5,203 | 1.79% |
| Peace and Freedom | 895 | 0.31% |
| Unknown | 1,141 | 0.39% |
| Other | 2,051 | 0.7% |
| No party preference | 55,985 | 19.21% |

#### Cities by population and voter registration

Cities by population and voter registration :
| City | Population | Registered voters | Democratic | Republican | D–R spread | Third parties, Unknown, Other | No party preference |
| Auburn | 13,776 | 10,072 | 3,488 | 3,724 | -2.34% | 932 | 1,928 |
| Colfax | 1,995 | 1,178 | 302 | 481 | -15.20% | 142 | 253 |
| Lincoln | 49,757 | 39,135 | 12,368 | 16,676 | -11.01% | 3,235 | 6,856 |
| Loomis | 6,836 | 5,070 | 1,121 | 2,566 | -28.50% | 478 | 905 |
| Rocklin | 71,601 | 47,936 | 15,142 | 19,173 | -8.41% | 4,018 | 9,603 |
| Roseville | 147,773 | 103,882 | 35,396 | 39,078 | -3.54% | 8,382 | 21,026 |

### Overview

In its early history Placer County was solidly Republican: it voted Republican in every election between 1860 and 1912, when Bull Moose nominee Theodore Roosevelt was California's official Republican nominee. Between 1916 and 1976, however, the county voted Republican only in three landslide elections of 1920, 1952 and 1972 – in all of which its GOP margins were much smaller than for the state or nation. Since the "Reagan Revolution" Placer County has become and remained a stronghold of the Republican Party; it consistently elects Republican public officials and has voted for presidential candidates from the party in every election since 1980.
United States presidential election results for Placer County, California :
| Year | Republican | Republican | Democratic | Democratic | Third party(ies) | Third party(ies) |
| Year | No. | % | No. | % | No. | % |
| 2024 | 123,941 | 52.76% | 103,958 | 44.25% | 7,034 | 2.99% |
| 2020 | 122,488 | 52.10% | 106,869 | 45.46% | 5,727 | 2.44% |
| 2016 | 95,138 | 51.14% | 73,509 | 39.52% | 17,377 | 9.34% |
| 2012 | 99,921 | 58.19% | 66,818 | 38.91% | 4,972 | 2.90% |
| 2008 | 94,647 | 54.45% | 75,112 | 43.21% | 4,053 | 2.33% |
| 2004 | 95,969 | 62.61% | 55,573 | 36.26% | 1,736 | 1.13% |
| 2000 | 69,835 | 59.28% | 42,449 | 36.04% | 5,515 | 4.68% |
| 1996 | 49,808 | 52.75% | 34,981 | 37.05% | 9,638 | 10.21% |
| 1992 | 38,298 | 41.92% | 30,783 | 33.69% | 22,285 | 24.39% |
| 1988 | 42,096 | 59.59% | 27,516 | 38.95% | 1,030 | 1.46% |
| 1984 | 38,035 | 62.94% | 21,294 | 35.24% | 1,098 | 1.82% |
| 1980 | 28,179 | 54.78% | 17,311 | 33.65% | 5,950 | 11.57% |
| 1976 | 18,154 | 45.03% | 21,026 | 52.16% | 1,131 | 2.81% |
| 1972 | 18,597 | 50.34% | 16,911 | 45.77% | 1,437 | 3.89% |
| 1968 | 12,427 | 42.64% | 14,050 | 48.21% | 2,667 | 9.15% |
| 1964 | 9,389 | 33.92% | 18,256 | 65.96% | 31 | 0.11% |
| 1960 | 10,439 | 43.75% | 13,304 | 55.75% | 120 | 0.50% |
| 1956 | 9,059 | 45.89% | 10,611 | 53.76% | 69 | 0.35% |
| 1952 | 9,841 | 50.59% | 9,444 | 48.55% | 168 | 0.86% |
| 1948 | 5,570 | 36.87% | 8,837 | 58.49% | 702 | 4.65% |
| 1944 | 4,196 | 36.78% | 7,149 | 62.66% | 64 | 0.56% |
| 1940 | 3,887 | 31.26% | 8,402 | 67.56% | 147 | 1.18% |
| 1936 | 2,321 | 22.34% | 7,959 | 76.62% | 108 | 1.04% |
| 1932 | 2,242 | 25.82% | 6,200 | 71.40% | 241 | 2.78% |
| 1928 | 3,669 | 49.25% | 3,685 | 49.46% | 96 | 1.29% |
| 1924 | 2,192 | 36.63% | 390 | 6.52% | 3,402 | 56.85% |
| 1920 | 2,894 | 59.44% | 1,559 | 32.02% | 416 | 8.54% |
| 1916 | 1,954 | 33.74% | 3,375 | 58.28% | 462 | 7.98% |
| 1912 | 15 | 0.34% | 1,823 | 41.84% | 2,519 | 57.82% |
| 1908 | 1,865 | 51.45% | 1,491 | 41.13% | 269 | 7.42% |
| 1904 | 2,050 | 62.61% | 1,023 | 31.25% | 201 | 6.14% |
| 1900 | 2,009 | 54.64% | 1,592 | 43.30% | 76 | 2.07% |
| 1896 | 1,890 | 51.41% | 1,721 | 46.82% | 65 | 1.77% |
| 1892 | 1,743 | 49.27% | 1,524 | 43.08% | 271 | 7.66% |
| 1888 | 1,761 | 52.35% | 1,547 | 45.99% | 56 | 1.66% |
| 1884 | 1,749 | 52.89% | 1,483 | 44.84% | 75 | 2.27% |
| 1880 | 1,643 | 52.71% | 1,416 | 45.43% | 58 | 1.86% |
In the United States House of Representatives, Placer County is within California's 3rd congressional district, represented by Kevin Kiley (R–Rocklin).
In the California State Senate, Placer County is split between the 1st, 4th, and 6th districts, represented by Megan Dahle, Marie Alvarado-Gil, and Roger Niello, respectively.
In the California State Assembly, the county is split between the 1st, 3rd, and 5th districts, represented by Heather Hadwick, James Gallagher, and Joe Patterson respectively.

### Crime

The following table includes the number of incidents reported and the rate per 1,000 persons for each type of offense.
Population and crime rates :
| Population | 343,554 | 343,554 |
| Violent crime | 816 | 2.38 |
| Homicide | 6 | 0.02 |
| Forcible rape | 61 | 0.18 |
| Robbery | 156 | 0.45 |
| Aggravated assault | 593 | 1.73 |
| Property crime | 4,274 | 12.44 |
| Burglary | 1,606 | 4.67 |
| Larceny-theft | 5,513 | 16.05 |
| Motor vehicle theft | 711 | 2.07 |
| Arson | 42 | 0.12 |

### Cities by population and crime rates

Cities by population and crime rates :
| City | Population | Violent crimes | Violent crime rate per 1,000 persons | Property crimes | Property crime rate per 1,000 persons |
| Auburn | 13,787 | 44 | 3.19 | 249 | 18.06 |
| Lincoln | 44,378 | 14 | 0.32 | 506 | 11.40 |
| Rocklin | 58,865 | 49 | 0.83 | 917 | 15.58 |
| Roseville | 122,896 | 293 | 2.38 | 3,288 | 26.75 |

## Economy
### Top employers

According to the county's 2010 Comprehensive Annual Financial Report, the top employers in the county are:
| # | Employer | # of Employees |
| 1 | Kaiser Permanente | 3,064 |
| 2 | Hewlett-Packard | 2,500 |
| 3 | Placer County | 2,400 |
| 4 | Union Pacific Railroad | 2,000 |
| 5 | Sutter Health | 1,983 |
| 6 | Northstar at Tahoe | 1,500 |
| 7 | Thunder Valley Casino Resort | 1,412 |
| 8 | City of Roseville | 1,282 |
| 9 | PRIDE Industries | 1,135 |
| 10 | Raley's Supermarkets | 1,006 |

### mPOWER Placer

mPOWER Placer is Placer County's Property Assessed Clean Energy (PACE) program. It provides financing to commercial, industrial, agricultural and multifamily property owners to install energy efficiency, water conservation and renewable energy retrofits. The program, administered by the Placer County Treasurer-Tax Collector’s Office, was approved by the Board of Supervisors on February 9, 2010, and launched on March 22, 2010, and is open to eligible Placer County property owners.

## Transportation
### Major highways

* Interstate 80
* State Route 28
* State Route 49
* State Route 65
* State Route 89
* State Route 174
* State Route 193
* State Route 267

### Public transportation

* Placer County Transit provides basic bus service primarily along the I-80 corridor between Alta and the Watt Ave. Sacramento Regional Transit light rail station. PCT also runs commuter service to Downtown Sacramento.
* The cities of Auburn, Lincoln, and Roseville have their own local transit service. The city of Roseville also offers a commuter service to Sacramento.
* Gold Country Stage (Nevada County) provides a connection between Auburn and Grass Valley.
* Tahoe Truckee Area Regional Transit, operated by Placer County and the City of Truckee, operates in Truckee (Nevada County), Tahoe City and along the North Shore of Lake Tahoe to Incline Village, Nevada.
* Greyhound and Amtrak provide long-distance intercity service.

### Airports

There are three general aviation airports in Placer County:
* Lincoln Regional Airport
* Auburn Airport
* Truckee-Tahoe Airport
The closest commercial airport is Sacramento International Airport in Sacramento.

## Communities
### Cities

* Auburn (county seat)
* Colfax
* Lincoln
* Rocklin
* Roseville

### Towns

* Loomis

### Census-designated places

* Alta
* Carnelian Bay
* Cedar Flat
* Dollar Point
* Dutch Flat
* Foresthill
* Granite Bay
* Kings Beach
* Kingvale
* Meadow Vista
* Newcastle
* North Auburn
* Penryn
* Sheridan
* Sunnyside-Tahoe City
* Tahoe Vista
* Tahoma

### Other communities

* Applegate
* Baxter
* Blue Canyon
* Bowman
* Emigrant Gap
* Northstar
* Ophir
* Olympic Valley
* Weimar

### Ghost town

* Iowa Hill

### Population ranking

The population ranking of the following table is based on the 2020 census of Placer County.
† county seat
| Rank | City/Town/etc. | Municipal type | Population (2020 Census) |
| 1 | Roseville | City | 147,773 |
| 2 | Rocklin | City | 71,601 |
| 3 | Lincoln | City | 49,757 |
| 4 | Granite Bay | CDP | 21,247 |
| 5 | † Auburn | City | 13,776 |
| 6 | North Auburn | CDP | 13,452 |
| 7 | Loomis | Town | 6,836 |
| 8 | Kings Beach | CDP | 3,563 |
| 9 | Meadow Vista | CDP | 3,263 |
| 10 | Colfax | City | 1,995 |
| 11 | Foresthill | CDP | 1,692 |
| 12 | Sunnyside-Tahoe City | CDP | 1,555 |
| 13 | Tahoe Vista | CDP | 1,392 |
| 14 | Sheridan | CDP | 1,385 |
| 15 | Newcastle | CDP | 1,321 |
| 16 | Dollar Point | CDP | 1,261 |
| 17 | Penryn | CDP | 1,150 |
| 18 | Tahoma (partially in El Dorado County) | CDP | 1,034 |
| 19 | Alta | CDP | 615 |
| 20 | Carnelian Bay | CDP | 518 |
| 21 | Dutch Flat | CDP | 183 |
| 22 | Kingvale (mostly in Nevada County) | CDP | 128 |
| 23 | Auburn Rancheria | AIAN | 2 |

## Education

School districts include:
Unified K-12:
* Center Joint Unified School District
* Rocklin Unified School District
* Tahoe-Truckee Unified School District
* Western Placer Unified School District
Secondary school districts:
* East Nicolaus Joint Union High School District
* Placer Union High School District
* Roseville Joint Union High School District
Additionally, Twin Rivers Unified School District includes a section of the county for grades 9–12 only.
Elementary school districts:
* Ackerman Elementary School District
* Alta-Dutch Flat Union Elementary School District
* Auburn Union Elementary School District
* Colfax Elementary School District
* Dry Creek Joint Elementary School District
* Elverta Joint Elementary School District
* Eureka Union Elementary School District
* Foresthill Union Elementary School District
* Loomis Union Elementary School District
* Newcastle Elementary School District
* Placer Hills Union Elementary School District
* Pleasant Grove Joint Union Elementary School District
* Roseville City Elementary School District