Chicago's street layout is like a well-designed circulatory system, with primary and secondary streets acting as arteries and veins. Primary streets run at one-mile intervals: North-South: Halsted (800 W), Ashland (1600 W), Western (2400 W), etc.
The typical right-of-way width for local, residential streets in the City of Chicago is 66 feet. This is consistent with the layout of many of the City's platted subdivisions, which provide for typical block dimensions that are 660 feet by 330 feet.
Each street address contains a directional prefix —N, S, E or W. A mile is roughly eight city blocks. So, say you walk eight blocks north from Madison on State — you'll be at 800 North State. Eight blocks west of State on Madison — that's right, you're at 800 West Madison.
Chicago's eastern boundary is formed by Lake Michigan, and the city is divided by the Chicago River into three geographic sections: the North Side, the South Side and the West Side. These sections surround the city's compact downtown area – the Loop.
Eight Chicago blocks = one MILE (3200 N) is 8 blocks = 1 mile north of Fullerton (2400 N)... assuming the same east/west location, of course. (In other words, the corner of Belmont and Western -- 3200 N Western Ave -- is going to be exactly 1 mile north of the corner of Fullerton and Western -- 2400 N Western Ave.)
1904 was the year Edward Paul Brennan suggested State and Madison Streets as the dividing line on which his numbering system should be based, marking the intersection "zero, zero." The City Council of Chicago accepted and passed his request in 1908.
Theoretically, at least in the greater Chicagoland area, Streets run east and west. Avenues run north and south. Places are partial blocks between Streets.
Generally, the upper levels of the multi-level streets usually serve local traffic. The primary entrances of buildings are usually located on this level. The lower levels generally serve through-traffic and trucks serving businesses along the roads.
"On December 2, 1942, man achieved here the first self-sustaining chain reaction and thereby initiated the controlled release of nuclear energy." Chicago Pile No. 1 (CP-1) was constructed in a makeshift laboratory under the grandstand of Stagg Field Stadium at The University of Chicago.
Chicago's eastern boundary is formed by Lake Michigan, and the city is divided by the Chicago River into three geographic sections: the North Side, the South Side and the West Side. These sections surround the city's compact downtown area – the Loop.