|State Street (Lockport and Fairmont only)|
|Length||33.6 mi (54.1 km)|
|Northeast end||State Street (Chicago) (approx. 1900 South)|
|Southwest end||Dartmouth Avenue, Joliet (turns into Collins Street locally)|
Archer Avenue, sometimes known as Archer Road outside the Chicago, Illinois city limits, and also known as State Street only in Lockport, Illinois and Fairmont, Illinois city limits, is a diagonal thoroughfare running northeast-to-southwest between Chicago's Chinatown and Lockport. Archer follows the original trail crossing the Chicago Portage between the Chicago River and the Des Plaines River, and parallels the path of the Illinois and Michigan Canal and the Alton Railroad. As a main traffic artery, it has largely been replaced by the modern Stevenson Expressway.
The street was named after the first commissioner of the Illinois and Michigan Canal, William Beatty Archer. One early map of Chicago (ca. 1830) listed what may have been the future Archer Road as "The Road to Widow Brown's"[nb 1].
Archer Avenue was made famous by Finley Peter Dunne in his books and sketches about the fictional saloonkeeper Mr. Dooley, whose tavern was on "Archey Road". The fictional Dooley "lived" in the real-life Bridgeport, Chicago neighborhood.
The east end of Archer begins in Chicago's Chinatown, then passes through the Bridgeport, McKinley Park and Brighton Park neighborhoods on its way to Archer Heights and Garfield Ridge. Outside Chicago, Archer Avenue/Road passes through the villages of Summit, Justice, Willow Springs, and the southern edge of Lemont before terminating on the north side of Lockport. Between Summit and Lockport, Archer Avenue is designated as a part of Illinois Route 171. Historically, this section of Archer was a part of Illinois Route 4, the original 1924 highway connecting St. Louis and Chicago. In 1926, Route 4 was rerouted to the north side of the Des Plaines River on an alignment that subsequently became U.S. Route 66, and its former route on Archer was redesignated as Illinois Route 4A. By 1939, Route 4A had been extended along the entire length of Archer Avenue into Downtown Chicago. In 1967, Route 4A was truncated back to Summit and merged into Illinois Route 171.
The former site of Argonne National Laboratory and its predecessor, the University of Chicago Metallurgical Laboratory in the forest preserve near Red Gate Woods, can be entered from an access road on Archer Avenue. This was once a secret Manhattan Project site, and is now known as the Site A/Plot M Disposal Site. Chicago Pile-1 (CP-1), the world's first nuclear reactor, was moved from Stagg Field to this site in 1943 and renamed Chicago Pile-2 (CP-2). The remains of CP-1, CP-2, and Chicago Pile-3 (CP-3) remain buried at this site.
Playland Amusement Park, now defunct, opened in mid-summer of 1950 and was located in Willow Springs, Illinois, which at that time was unincorporated. The area is now in Justice, Illinois. The amusement park was located at 9300 West 79th Street in Willow Springs. 
- "There is a dispute about the route taken from Chicago to Widow Brown's house in the woods on the north branch of Hickory Creek (east of Mokena). One historian asserts that it went southwest (on Archer Ave. to Justice Park), thence ... . Others assert that it went southward on State St. and Vincennes Ave. on the road to Blue Island, and thence southwesterly on what is now the Southwest Highway."
- Encyclopedia of Chicago Archived September 29, 2007, at the Wayback Machine.
- Map of Hardscrabble Area, 1830
- "Nature Bulletin 738 Early Cook County Roads -- Park One". Nature Bulletins. Forest Preserve District of Cook County (Illinois). 1964-01-11. Retrieved 2009-04-28.
- Haunted Archer Avenue!
- Ursula Bielski, Chicago Haunts: Ghostlore of the Windy City, 2nd ed., Chicago: Lake Claremont Press, 1997.
- 1924 Illinois Road Map
- 1926 Illinois Official Auto Road Map
- 1939-1940 Illinois Road Map
- 1967 Illinois Official Highway Map
- Argonne National Laboratory Archived June 16, 2007, at the Wayback Machine.
- Playland Amusement Park Facebook Group