# U.S. Route 20 in Illinois

U.S. Route 20 (US 20) in the state of Illinois runs northwest to southeast in the northern end of the state. It crosses the Mississippi River into East Dubuque and exits Chicago south of the Chicago Skyway; the highway is 233.93 miles (376.47 km) long. From Rockford eastward, US 20 begins to parallel Interstate 90 (I-90), and both highways follow each other until their Massachusetts terminus.
For its entire length in Illinois, US 20 is designated as the General Ulysses S. Grant Highway (often abbreviated the U.S. Grant Memorial Highway), though this designation is used primarily west of Elgin. The route forms highway-grade bypasses around Freeport, Rockford, and Elgin; east of the Elgin bypass (known as the Elgin Bypass or Dr. Martin Luther King Jr. Memorial Highway), US 20 becomes the multilane surface Lake Street within Cook County. Within the southwestern suburbs and the South Side, US 20 runs concurrently with US 12 and US 45 (later US 41), ultimately leaving Illinois on Indianapolis Boulevard.

## Route description
### Northwest Illinois

As the highway enters Illinois across the Julien Dubuque Bridge, it continues southeasterly for a while, paralleling the Upper Mississippi River before turning east into the rugged country of the Driftless Area in Jo Daviess County, then turning flat and straight west of Stockton and entering Stephenson County. The Ulysses S. Grant Home, a national landmark, fronts near the highway at the eastern edge of Galena.
The road between Dubuque and Stockton was once known as the most dangerous stretch of road because of the hills and curves flanked by cliffs and valleys. Travelers were greeted with signs reminding them to drive carefully as they entered this stretch of road.
In Freeport, US 20 is routed onto a controlled-access freeway bypass. Between Freeport and Rockford, the route is a four-lane divided highway with two traffic light-controlled intersections, at Pecatonica Road and at Winnebago Road/Elida Street. The Rockford bypass routes US 20 onto a full controlled-access freeway; it remains this way until it overlaps Interstate 39 (I-39) southeast of downtown Rockford.

### Rockford to Elgin

East of Rockford, the routing of US 20 runs parallel with I-90; US 20 serves minor cities that are not accessible from the Jane Addams Memorial Tollway. It is a four-lane divided highway from I-39 to just east of Belvidere; for the rest of this segment, it is a winding, rural two-lane road.
US 20 travels through the downtowns of the small towns and unincorporated areas of Garden Prairie, Harmony and Starks, as well as the city of Marengo. At Starks, eastbound US 20 overlaps southbound Illinois Route 47 (IL 47) and westbound IL 72, forming a wrong-way concurrency. All three routes pass beneath a railroad viaduct before separating south of Starks.
Continuing east, US 20 travels through Pingree Grove before entering the Elgin area. Before entering Elgin, US 20 widens to a four-lane controlled-access freeway that bypasses Elgin, around the town's south end. This road is known as the Elgin Bypass.

### Elgin to Indiana

At the end of the Elgin bypass, US 20 takes on the name of Lake Street. US 20 has numerous high-volume intersections, including a grade-separated interchange with IL 59. In Hanover Park, an early-2000s reconstruction project widened lanes on the road and created a median for safer travel; east of Barrington Road/County Farm Road, the road briefly becomes six lanes for one mile (1.6 km) until the Elgin–O'Hare Expressway.
US 20 continues in an east-southeast direction through the town center of Bloomingdale and becomes six lanes at the Bloomingdale–Roselle border. It maintains six lanes through a very high traffic corridor to I-290 and onward to IL 53 before it returns to four lanes while serving downtown Addison, paralleling I-290 to the north. Past Elmhurst, the road overlaps I-290 for a mile (1.6 km).
US 20 continues through Stone Park and Melrose Park before turning south and joining US 12/US 45 on Mannheim Road. In La Grange, the combined US 12, US 20, and US 45 traveling on La Grange Road intersect with Ogden Avenue, which carries US 34, one of the few places where four U.S. Numbered Highways intersect. La Grange Road continues south until US 20 turns onto 95th Street eastbound with US 12. This combination later joins with US 41, where the three routes follow Ewing Avenue and Indianapolis Boulevard, which are the last portions of US 20 prior to its crossing the state line into Indiana.

## History

The routing of US 20 has not changed since 1938. Prior to 1938, US 20 continued east on Lake Street east of Mannheim Road (US 12/US 45). It ran through downtown Chicago and exited Chicago south on what is now Torrence Avenue. In 1955, the Illinois General Assembly designated the entire length of US 20 in Illinois the "U.S. Grant Memorial Highway". New signs were produced in late 2007 to reflect this designation along its entire length.

### Elgin Bypass

Construction of the Golf Road (IL 58) extension to Summit Street in Elgin was completed in 1932. In 1958, I-90 was built through the north side of Elgin extending east to Devon Avenue and on to Chicago by 1960. In 1935, concerned about increasing numbers of traffic, residents of Elgin laid plans to build a bypass. US 20 had been routed down Villa Street, Highland Avenue, and Larkin Avenue through downtown Elgin. A section of freeway opened south of Elgin as the Elgin Bypass 27 years later.
The segment of the Elgin Bypass between McLean Boulevard and Grace Street (IL 25), including the Fox River bridge, was opened first. Later, the outer segments of the bypass—to Randall Road on the west and Bluff City Boulevard on the east—were opened. On November 30, 1962, Governor Otto Kerner Jr. dedicated the Elgin Bypass.
From 1962 until 1984, the old route was designated as US 20 Business (US 20 Bus.).
In 2012–2016, the interchange between the Elgin Bypass and McLean Boulevard was upgraded to a single-point urban interchange, the bridge was widened and replaced, and portions of the bypass were repaved at a cost of $44.4 million (equivalent to $55.3 million in 2023).
In 2019, the interchange between the Elgin Bypass and Randall Road received a $9-million (equivalent to $10.6 million in 2023) upgrade so that northbound Randall Road traffic can enter the eastbound Elgin Bypass without making a left turn at a traffic light.
Starting in 2014, a comprehensive study of the Elgin Bypass corridor resulted in a number of recommendations including a wider bridge across the Fox River, a replacement bridge for IL 31 crossing the bypass, and replacement of other bridges. The 2019 estimates of the recommended improvements total $84 million (equivalent to $98.7 million in 2023), with $10.6 million (equivalent to $12.5 million in 2023) designated for the IL 31 bridge.

## Future

Long range plans call for US 20 to be upgraded to a four lane highway from Rockford to East Dubuque. The project dates back to the 1970s, when a major supplemental freeway system was proposed in Illinois. US 20 has been completed as a four lane freeway/expressway combination between Rockford and Freeport as well as Galena and East Dubuque. The remaining gap between Freeport and Galena is planned to be filled, but efforts have stalled in recent years, mainly due to funding issues.

## Major intersections

All exits are unnumbered.
| County | Location | mi | km | Destinations | Notes |
| Mississippi River | Mississippi River | 0.0 | 0.0 | US 20 west / Great River Road (National Route) north – Dubuque | Continuation into Iowa |
| Iowa–Illinois state line (Julien Dubuque Bridge) ||
| Jo Daviess | East Dubuque | 0.7 | 1.1 | IL 35 north – Wisconsin | Interchange; southern terminus of IL 35; no eastbound entrance |
| Jo Daviess | Rawlins Township | 11.2 | 18.0 | IL 84 north – Hazel Green | Western end of IL 84 overlap |
| Jo Daviess | Elizabeth Township | 26.4 | 42.5 | IL 84 south / Great River Road (National Route) south (Washington Street) – Hanover, Savanna | Eastern end of IL 84/Great River Road overlap |
| Jo Daviess | Stockton | 41.7 | 67.1 | IL 78 south (Main Street) – Mount Carroll | Western end of IL 78 overlap |
| Jo Daviess | Stockton–Wards Grove township line | 42.9 | 69.0 | IL 78 north – Warren | Eastern end of IL 78 overlap |
| Stephenson | Lena | 50.8 | 81.8 | IL 73 – Lena, Pearl City | |
| Stephenson | Freeport | 57.4 | 92.4 | US 20 Bus. east – Freeport | Western terminus of US 20 Bus.; western end of freeway |
| Stephenson | Freeport | 61.8 | 99.5 | IL 26 – Freeport, Monroe | |
| Stephenson | Freeport | 65.0 | 104.6 | IL 75 – Freeport, Rockton | |
| Stephenson | Freeport | 68.8 | 110.7 | Springfield Road – Freeport | Eastbound exit and westbound entrance |
| Stephenson | Freeport | 68.8 | 110.7 | US 20 Bus. west – Freeport | Westbound exit and eastbound entrance; eastern terminus of US 20 Bus.; eastern end of freeway; western end of divided highway |
| Winnebago | Rockford | 85.9 | 138.2 | US 20 Bus. east (State Street) | Eastbound exit and westbound entrance; western terminus of US 20 Bus.; eastern end of divided highway; western end of freeway section |
| Winnebago | Rockford | 87.7 | 141.1 | CR 24 (Meridian Road) | |
| Winnebago | Rockford | 90.1 | 145.0 | CR 27 (Montague Road) | |
| Winnebago | Rockford | 92.7 | 149.2 | IL 2 (Main Street) – Dixon | |
| Winnebago | Rockford | 94.6 | 152.2 | IL 251 (11th Street) – Rochelle | |
| Winnebago | Rockford | 96.8 | 155.8 | Alpine Road | |
| Winnebago | Rockford | 97.3 | 156.6 | I-39 south / US 51 south – Bloomington, Normal | Western end of I-39/US 51 overlap |
| Winnebago | Rockford | 100.4 | 161.6 | I-39 Toll north / US 51 north to I-90 Toll (Jane Addams Memorial Tollway) / Harrison Avenue – Chicago, Wisconsin, Rockford | Cloverleaf interchange; eastern end of freeway section; eastern end of I-39/US 51 overlap; I-39 exit 122A |
| Boone | Belvidere | 106.1 | 170.8 | Appleton Road | Interchange |
| Boone | Belvidere | 108.0 | 173.8 | US 20 Bus. west (Belvidere Road) to I-90 Toll (Genoa Road) | Eastern terminus of US 20 Bus. |
| McHenry | Marengo | 119.2 | 191.8 | IL 23 (State Street) to IL 176 (Telegraph Street) | |
| Kane | Hampshire | 128.0 | 206.0 | I-90 Toll (Jane Addams Memorial Tollway) – Chicago, Rockford | I-90 exit 42 |
| Kane | Pingree Grove | 133.6 | 215.0 | IL 47 north / IL 72 east (Higgins Road) – Huntley, West Dundee | Western end of IL 47/IL 72 overlap |
| Kane | Pingree Grove | 134.0 | 215.7 | IL 47 south / IL 72 west – Elburn, Hampshire | Eastern end of IL 47/IL 72 overlap |
| Kane | Elgin | 141.5 | 227.7 | CR 34 (Randall Road) | Western end of Elgin Bypass freeway |
| Kane | Elgin | 141.6 | 227.9 | Larkin Avenue | Eastbound exit and westbound entrance |
| Kane | Elgin | 143.0 | 230.1 | McLean Boulevard | |
| Kane | Elgin | 144.4 | 232.4 | IL 31 (State Street) | |
| Kane | Elgin | 145.1 | 233.5 | IL 25 | Split into separate north and south exits westbound |
| Cook | Elgin | 146.4 | 235.6 | Villa Street | Westbound exit and eastbound entrance; eastern end of Elgin Bypass |
| Cook | Bartlett | 148.6 | 239.1 | IL 59 (Sutton Road) – Barrington, West Chicago | Interchange |
| DuPage–Cook county line | Hanover Park | 151.9 | 244.5 | CR 43 south (County Farm Road), Barrington Road | Northern terminus of CR 43; County Farm Road continues north as Barrington Road |
| DuPage | Hanover Park | 152.6 | 245.6 | IL 390 Toll east (Elgin–O'Hare Tollway) | I-Pass only; interchange; western terminus of IL 390 |
| DuPage | Hanover Park | 152.9 | 246.1 | CR 29 west (Greenbrook Boulevard) | Eastern terminus of CR 29 |
| DuPage | Roselle | 153.9 | 247.7 | CR 23 (Gary Avenue) | |
| DuPage | Bloomingdale | 156.2 | 251.4 | CR 4 (Bloomingdale Road) | |
| DuPage | Addison | 157.8 | 254.0 | CR 24 (Medinah Road) | |
| DuPage | Addison | 158.6 | 255.2 | I-355 to I-290 – Joliet, Chicago, Rockford | I-355 exit 31 |
| DuPage | Addison | 158.8 | 255.6 | IL 53 (Rohlwing Road) | |
| DuPage | Addison | 161.4 | 259.7 | CR 22 north (Addison Road) | Southern terminus of CR 22 |
| DuPage | Addison | 162.0 | 260.7 | CR 28 (Villa Avenue, Wood Dale Road) | |
| DuPage | Addison–Elmhurst line | 162.6 | 261.7 | IL 64 Truck west / IL 83 (Kingery Highway) to I-290 CR 20 east (Grand Avenue) | Interchange; western end of IL 64 Truck overlap |
| DuPage | Elmhurst | 163.8 | 263.6 | York Road, North York Street | Interchange |
| DuPage | Elmhurst | 163.8 | 263.6 | I-290 west – Rockford | Western end of I-290 overlap; I-290 exit 12 |
| DuPage | Elmhurst | 164.8 | 265.2 | I-290 east to I-294 Toll south (Tri-State Tollway) – Chicago, Indiana | Eastern end of I-290 overlap; I-290 exit 13A; I-294 north exit 31 |
| DuPage | Elmhurst | 165.2 | 265.9 | IL 64 east (North Avenue) / IL 64 Truck end | Interchange; eastern end of IL 64 Truck overlap; eastbound left exit and westbound left entrance |
| Cook | Northlake | 165.4 | 266.2 | I-294 Toll north (Tri-State Tollway) – Milwaukee, O'Hare | I-294 exit 33 |
| Cook | Berkeley | 167.3 | 269.2 | US 12 west / US 45 north (Mannheim Road north) | Western end of US 12/US 45 overlap |
| Cook | Bellwood–Hillside line | 168.4 | 271.0 | IL 56 west (Washington Boulevard) | Eastern terminus of IL 56 |
| Cook | Hillside–Westchester line | 169.2 | 272.3 | I-290 / IL 110 (CKC) (Eisenhower Expressway) | I-290 exit 17 |
| Cook | Hillside–Westchester line | 169.7 | 273.1 | IL 38 west (Roosevelt Road) | Eastern terminus of IL 38 |
| Cook | La Grange | 172.9 | 278.3 | US 34 (Ogden Avenue) | |
| Cook | Countryside–Hodgkins line | 174.1 | 280.2 | Historic US 66 (Joliet Road) | |
| Cook | Countryside–Hodgkins line | 176.8 | 284.5 | I-55 (Stevenson Expressway) to I-294 Toll north – Chicago, St. Louis | I-55 exit 279 |
| Cook | Willow Springs | 178.1 | 286.6 | IL 171 (Archer Avenue) to 79th Street / I-294 Toll south (Tri-State Tollway) – Indiana | Cloverleaf interchange; left exit eastbound |
| Cook | Hickory Hills | 180.2 | 290.0 | US 45 south (La Grange Road south) | Eastern end of US 45 overlap |
| Cook | Bridgeview | 182.5 | 293.7 | I-294 Toll (Tri-State Tollway) – Wisconsin, Indiana | Tolled; I-294 exit 17 |
| Cook | Bridgeview | 182.9 | 294.3 | IL 43 (Harlem Avenue) | Cloverleaf interchange |
| Cook | Oak Lawn | 185.9 | 299.2 | IL 50 (Cicero Avenue) | |
| Cook | Chicago | 191.0 | 307.4 | Halsted Street to I-57 / I-94 east / IL 1 | |
| Cook | Chicago | 192.0 | 309.0 | I-94 west (Dan Ryan Expressway) | I-94 exit 62 |
| Cook | Chicago | 194.0 | 312.2 | Stony Island Avenue to I-94 | Northern terminus of Stony Island Avenue expressway (southbound); at-grade street northbound |
| Cook | Chicago | 196.5 | 316.2 | US 41 north / LMCT (Ewing Avenue north) | Western end of US 41 overlap |
| Cook | Chicago | 197.9 | 318.5 | I-90 Toll west / Chicago Skyway west | Signed as "To I-90 west"; access to I-90 east is in Indiana; I-90 exit 107 |
| Cook | Chicago | 198.0 | 318.7 | US 12 east / US 20 east / US 41 south / LMCT (Indianapolis Boulevard) – Hammond | Continuation into Indiana |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus Incomplete access Tolled ||||||

## Business routes

US 20 has been rerouted around the cities of Freeport, Rockford, Elgin, and Chicago. A bypass is currently planned for Galena.
The longest US 20 Bus. in Illinois runs 21 miles (34 km) from just west of Rockford to just east of Belvidere. The route begins just west of Weldon Road and runs as State Street into downtown Rockford, where it is split into two one-way streets (Chestnut Street and Walnut Street for eastbound traffic and Jefferson Street for westbound traffic). The route continues east along State Street all the way through Rockford and becomes a two-lane highway between Rockford and Belvidere. US 20 Bus. is then routed in an outer loop around the city of Belvidere before merging back with US 20 near Genoa Road and I-90.
US 20 Bus. in Elgin was removed in 1984. This ran along Larkin Avenue, Highland Avenue, Chicago Street, and Villa Avenue. The current routing of US 20 south of Elgin is called the Elgin Bypass.
US 20 Bus. in Chicago was removed in 1968. This existed from 1960 through 1968; before then, it was US 20 City from 1938 to 1960.