Boroughitis (also borough fever or borough mania) was the creation in the 1890s, usually by referendum, of large numbers of small boroughs in the U.S. state of New Jersey, particularly in Bergen County. Attempts by the New Jersey Legislature to reform local government and school systems led to the breakup of most of Bergen County's townships into small boroughs, which still balkanize the state's political map. This occurred following the development of commuter suburbs in New Jersey, residents of which wanted more government services, whereas the long-time rural population feared the increases in taxation that would result.
In the late 19th century, much of New Jersey was divided into large townships. In Bergen County, several of these townships contained multiple commuter suburbs, often formed around railroad stations. Political disputes arose between the growing number of commuters, who wanted more government services for the new developments near railroad lines, and long-time residents such as farmers, who understood this to come with higher taxes. A previously little-used law permitted small segments of existing townships to vote by referendum to form independent boroughs. In late 1893, Republicans, backed by commuters, captured control of the legislature; the following year, they passed legislation allowing boroughs that were formed from parts of two or more townships to elect a representative to the county Board of Chosen Freeholders. This 1894 act, in combination with a second one the same year that consolidated school districts into one per municipality, made it easy and attractive for dissatisfied communities to break away and become boroughs, in order to gain a seat on the county board or to keep control of the local school.
Forty new boroughs were formed in 1894 and 1895, with the bulk in Bergen County, where most townships were broken up or greatly reduced in size; there are few there today. The state legislature scuttled the right to elect a freeholder in 1895, and ended the formation of boroughs by referendum the following year. Municipalities continued to be created by the legislature into the 20th century, and although there have been efforts at consolidation in recent years to lower the high cost of government, they have not been particularly effective.