# Matanuska-Susitna Borough, Alaska

Matanuska-Susitna Borough (often referred to as the Mat-Su Borough) is a borough located in the U.S. state of Alaska. Its borough seat is Palmer, and the largest community is the census-designated place of Knik-Fairview. As of the 2020 census, the borough's population was 107,801.
The borough is part of the Anchorage Metropolitan Statistical Area, along with the municipality of Anchorage on its south.
The Mat-Su Borough is so designated because it contains the entire Matanuska and Susitna Rivers. They empty into Cook Inlet, which is the southern border of the Mat-Su Borough. It is one of the few agricultural areas of Alaska.

## Geography

The borough seat is Palmer, and the largest community is the census-designated place of Knik-Fairview, Alaska.
As of the 2020 census, the population was 107,081, up from 88,995 in 2010. It is the fastest growing subdivision in Alaska.
According to the United States Census Bureau, the borough has a total area of 25,258 square miles (65,420 km$^2$), of which 24,608 square miles (63,730 km$^2$) is land and 650 square miles (1,700 km$^2$) (2.6%) is water.

### Adjacent boroughs and census areas

* Denali Borough, Alaska - north
* Southeast Fairbanks Census Area, Alaska - northeast
* Copper River Census Area, Alaska - east
* Chugach Census Area, Alaska - east
* Municipality of Anchorage, Alaska - south
* Kenai Peninsula Borough, Alaska - south
* Bethel Census Area, Alaska - west
* Yukon-Koyukuk Census Area, Alaska - west

### National protected areas in the borough

* Chugach National Forest (part)
* Denali National Park and Preserve (part)
** Denali Wilderness (part)
* Lake Clark National Park and Preserve (part)
** Lake Clark Wilderness (part)

## Demographics

As of the census of 2000, there were 59,322 people, 20,556 households, and 15,046 families residing in the borough. The population density was 2 people per square mile (0.77 people/km$^2$). There were 27,329 housing units at an average density of 1 per square mile (0.39/km$^2$). The racial makeup of the borough was 87.55% White, 0.69% Black or African American, 5.50% Native American, 0.70% Asian, 0.12% Pacific Islander, 0.86% from other races, and 4.57% from two or more races. 2.50% of the population were Hispanic or Latino of any race.
There were 20,556 households, out of which 42.30% had children under the age of 18 living with them, 58.90% were married couples living together, 9.10% had a female householder with no husband present, and 26.80% were non-families. 20.30% of all households were made up of individuals, and 4.10% had someone living alone who was 65 years of age or older. The average household size was 2.84 and the average family size was 3.29.
In the borough the population was spread out, with 32.20% under the age of 18, 7.40% from 18 to 24, 31.10% from 25 to 44, 23.40% from 45 to 64, and 5.90% who were 65 years of age or older. The median age was 34 years. For every 100 females, there were 108.20 males. For every 100 females age 18 and over, there were 108.10 males.
Schools in the borough are administered by the Matanuska-Susitna Borough School District.

## Politics and government

United States presidential election results for Matanuska-Susitna Borough, Alaska :
| Year | Republican | Republican | Democratic | Democratic | Third party(ies) | Third party(ies) |
| Year | No. | % | No. | % | No. | % |
| 2024 | 40,140 | 72.50% | 13,343 | 24.10% | 1,882 | 3.40% |
| 2020 | 38,492 | 71.90% | 12,849 | 24.00% | 2,195 | 4.10% |
| 2016 | 31,947 | 74.39% | 8,598 | 20.02% | 2,398 | 5.58% |
| 2012 | 27,339 | 72.68% | 9,317 | 24.77% | 959 | 2.55% |
| 2008 | 30,246 | 74.50% | 9,297 | 22.90% | 1,056 | 2.60% |
| 2004 | 17,569 | 72.71% | 6,201 | 25.66% | 394 | 1.63% |
| 2000 | 17,976 | 69.31% | 5,379 | 20.74% | 2,579 | 9.94% |
| 1996 | 11,306 | 59.81% | 4,522 | 23.92% | 3,074 | 16.26% |
| 1992 | 7,564 | 39.13% | 4,379 | 22.66% | 7,385 | 38.21% |
| 1988 | 8,856 | 65.01% | 4,172 | 30.63% | 594 | 4.36% |
| 1984 | 9,944 | 73.69% | 2,940 | 21.79% | 610 | 4.52% |
| 1980 | 5,012 | 61.36% | 1,316 | 16.11% | 1,840 | 22.53% |
| 1976 | 2,884 | 60.70% | 1,485 | 31.26% | 382 | 8.04% |
| 1972 | 2,004 | 66.62% | 694 | 23.07% | 310 | 10.31% |
| 1968 | 1,076 | 46.42% | 892 | 38.48% | 350 | 15.10% |
| 1964 | 964 | 43.72% | 1,241 | 56.28% | 0 | 0.00% |
| 1960 | 1,152 | 52.20% | 1,055 | 47.80% | 0 | 0.00% |
Republicans have carried the Matanuska-Susitna borough in every election except for 1964. Though the borough has aligned with the statewide presidential election winner in Alaska in every election since statehood, it has come to stand out as one of the most Republican areas in Alaska, alongside the neighboring, less populated Southeast Fairbanks Census Area. In 2020, around 20% of Donald Trump's vote share in the state came from this borough alone.
Edna DeVries is the mayor of the Matanuska-Susitna Borough. The borough has a strong-manager form of government. Mike Brown is the borough manager. Long-time Manager John Duffy retired in 2010.
Sarah Palin was previously the mayor of Wasilla, the largest city in the borough.

## Communities
### Cities

* Houston
* Palmer (Borough seat)
* Wasilla

### Census-designated places

* Big Lake
* Buffalo Soapstone
* Butte
* Chase
* Chickaloon
* Eureka Roadhouse
* Farm Loop
* Fishhook
* Gateway
* Glacier View
* Knik River
* Knik-Fairview
* Lake Louise
* Lazy Mountain
* Meadow Lakes
* North Lakes
* Petersville
* Point MacKenzie
* Skwentna
* South Lakes
* Susitna
* Susitna North
* Sutton-Alpine
* Talkeetna
* Tanaina
* Trapper Creek
* Willow

### Unincorporated community

* Alexander Creek

## Cyber attack

In July 2018, the borough's computer systems, including the library and animal shelter, were hit by a ransomware attack, forcing employees to do without computers, using electric typewriters where available. The borough declared a state of emergency and incurred over $2 million in costs. The method is thought to have been a targeted phishing e-mail; data left by the malware indicated Mat-Su was the 210th target attacked.

## Education

The school district is Matanuska-Susitna Borough School District.