The population has more than doubled since 1920 and barring any unexpected changes in the future, this trend appears likely to continue. The majority of the population increase on a municipality basis occurred mainly within the central parts of the county. Nevertheless, the townships, as compared to the boroughs, had the larger increase, with many of them surrounding or adjoining a borough. This is probably an indication that the boroughs will soon run out of space for additional developments. When this happens people may start to build in the urban fringes and work their way out.
Union County has and still is undergoing a steady decline in the number of people per household.
But this decline is consistent with both state and national trends. In 1990, Union County had 2.64 persons per household compared to the United States' 2.63 persons per household. This increase in a smaller number of persons per household, coupled with a rise in population, will result in a need for more housing units. It is therefore recommended that local municipalities and governments establish programs that provide for more housing units in the County. However, the total number of people not in the labor force has been increasing.