Latrobe Borough grew as more areas of Derry and Unity Townships were incorporated and expanded from three to six wards in 1906. The above map shows the dates when the various parts of Unity and Derry townships were annexed to the borough.
Steel companies emerged in the first half of the century. Brickyards and distilleries flourished, in addition to a woolen mill, a ceramics company, and even a mattress factory. Coal mines, steel mills, and the railroad were major employers, along with a steadily growing variety of businesses and stores in downtown Latrobe.
The population of the town increased as more and more European immigrants-particularly Irish, German, Italian, Polish, and Slovak were attracted by the employment opportunities in the area.
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