The Chicago Fire of 1874 took place on July 14. Reports of the extent of the damage vary somewhat, but sources generally agree that the fire burned 47 acres (19 ha) just south of the Loop, destroyed 812 structures and killed 20 people. The affected neighborhood had been home to Chicago's community of Jewish immigrants from Russia and Poland, as well as to a significant population of middle-class African-American families; both ethnic groups were displaced in the aftermath of the fire to other neighborhoods on the city's West and South Sides.
The fire insurance industry's National Board of Underwriters responded to the fire by demanding widespread changes in Chicago's fire prevention and firefighting efforts. They ultimately encouraged fire insurers to cancel all coverage of buildings in the city in October. Many insurers did halt their activities in Chicago, and only returned to issuing policies in the city after the municipal government adopted many of the suggested reforms.
In the immediate aftermath of the fire, there were some attempts to give the event a nickname to correspond with the much larger "Great Chicago Fire" of 1871. On July 17, three days after the fire, the Chicago Tribune suggested calling "the recent event 'The Little Chicago Fire,' to distinguish it from 'The Big Chicago Fire' that took place three years ago." In a later memoir, a fire insurance executive from Chicago claimed that the event was "known as the 'little big fire.'" These nicknames never took permanent hold, however, and more recent publications refer to the event simply as "the fire of 1874" or "the second Chicago fire".
The 1871 fire spurred new fireproof regulations that prohibited wooden buildings to be constructed in the area bordered by 22nd Street to the south, the Chicago River to the north, Halsted Street to the west and Lake Michigan to the east. Wooden buildings already existing within those boundaries were grandfathered in and temporary wooden structures could be erected until replaced by permanent structures. City regulations mandated that those "temporary" buildings must come down within a year, but many remained.
July 14 was a hot day in the city, with a temperature above 90 °F (32 °C). The weather had been dry for weeks, with only one day recording more than a trace of rain since early June. It was these circumstances, along with a "strong prairie wind" blowing from the southwest, that made the 1874 fire similar to the 1871 fire.
The section burned in the 1874 fire was south of the Chicago core that was rebuilt after the 1871 fire. This area south of the Loop was considered undesirable by many, according to the Chicago Tribune: “This part of the city consists of the worst rookeries imaginable, most of which are occupied as houses of ill-fame.” The neighborhood was described as a "broad belt of wooden buildings which menaced the new structures which have sprung up in the business quarter of the South Division." Some of these buildings had been relocated to that part of the city from the South Division—the Tribune calls this relocation the act of "a weak Common Council and a weak Mayor", who endangered the city by packing these flammable wooden frame buildings too closely together upon relocation. Water mains in that part of the city were insufficient for fire-fighting purposes, being "mostly four inches in diameter and largely choked up with rust and corrosion so that one steam fire engine could not get a sufficient supply from a fire plug." The neighborhood, on the eve of the fire, was a densely packed tinderbox that, especially under the dry and windy conditions, was highly susceptible to becoming the site of a major conflagration.
Although all accounts were clear in identifying the fire's origin a little before 4:30 p.m. in the neighborhood generally known as the "Cheyenne District", reports differ as to the exact location of the start of the fire. According to the report of the Fire Marshal, the fire began on Fourth Avenue (now Federal Street), and quickly spread to an oil works building near Clark Street and Fourth. The fire was further fueled by the ten to twelve barrels of oil in the alley near the oil works building.
The San Francisco Elevator published an article on August 8, 1874, identifying a Polish Jewish rag shop filled with flammable materials at 527 S. Clark as the source of the blaze. The shopkeeper was allegedly absent at the time of the fire's discovery, but a prostitute who was occupying the room west of the building discovered the fire and sounded the alarm at box 37 at 4:29 p.m.
In his three volume history of Chicago published in 1884, Alfred T. Andreas wrote that "on July 14, 1874, at 4:29 P. M., a fire of supposed incendiary origin was started in the two-story frame building, No. 449 South Clark Streets, owned by Le Grand Odell, and occupied as a saloon by E. T. Cregier."
In 2009, a Chicago-area librarian and online columnist, Alice Maggio, claimed in an article about the fire that it originated in a small barn "near the corner of Clark and 12th Street", similar to the debunked theory as to the start of the Chicago Fire of 1871. Maggio claimed that the barn was located next to the oil factory mentioned in the Fire Marshal's report. The exact cause of the fire was not clear, but area residents alleged that its owner, Nathan Isaacson, had set the fire intentionally. In the aftermath of the fire, Isaacson was arrested and charged with arson. Although some of his neighbors testified in court alleging to have witnessed him setting the fire, he was never convicted. Maggio suggests that these witnesses' statements were motivated more by racial prejudice than by any hard evidence.
According to the Tribune's article published the day following the fire, the fire began in "the centre of the block bounded by Twelfth, Taylor, and Clark streets, and Fourth avenue," a portion of the city the Tribune calls "the Cheyenne District." Due to a strong wind blowing from the southwest, the fire did not travel far south from its origin, halting before it reached Twelfth Street in that direction. Instead, the flames blew north and east, reaching the corner of Taylor and State Street by about 5:30 p.m. – by 6:00 p.m., the steeple of the German Methodist Church on the corner of Third and Polk caught fire. The fire crossed State Street at about 6:30 p.m., and was nearing Wabash Avenue at 7:00 p.m. when an alderman appealed to Police Superintendent Rehm to use gunpowder to blow up some buildings in the fire's path to act as a firebreak. Rehm refused, saying he was not authorized to take such an action, and the alderman appealed to Mayor Harvey Doolittle Colvin, also without success. Ultimately some attempts were made under the direction of Mark Sheridan, an alderman and one of the city's police commissioners, but sufficient quantities of gunpowder were too hard to acquire on such short notice, and the few wooden frame buildings that were demolished by these efforts did very little to slow the fire's progress.
The city's firefighters tried to hem the fire in on north and south, driving the flames east towards Lake Michigan in order to contain the damage they could do—in doing so, it seemed at the time that this strategy would ensure that the residences along the lake on Michigan Avenue would be lost, but ultimately the fire department was able to almost completely halt the blaze just short of that street. As the fire moved north along State Street, observers feared that the heart of the city's business district would be gutted again (as it was by the 1871 fire), but just north of the St. James Hotel and just south of Van Buren Street, a fire-proof wall was maintained that stopped the fire's progress just short of the Loop. The moment at which it was clear that the wall, called "the citadel of the conflagration" in one account, would mark the northernmost limit of the fire's destruction was characterized by one contemporary journalist as the turning point in the fire department's attempts to control the flames. The fire burned itself out around midnight, claiming the Michigan Avenue Hotel as the last major building destroyed by the flames.