Idaho Maps offers historical and pictorial perspectives of its rich Idaho’s past. This section is a peripheral look through the U.S. Census, and what took place during that decadal era.
The 1920 census incurred 21 new counties since the previous decadal enumeration to its present-day borders; though there had been few previous counties who may had their borders realigned in the next few years, such as Ada, Bannock, Butte, Caribou, Custer, Elmore, Franklin, Oneida, and Owyhee counties, due to population adjustments.
The U.S. Census Bureau reported that Idaho’s population in 1920 was 431,866, which was an increase by 25 percent from the previous enumeration. Today Idaho’s 44 counties remained intact since this census had been taken.
The following table below is associated by groups (in color) to the year to which the county was created on.
To see below how Idaho had fair since the 1920’s until the last census enumeration:
Original Works © Elaine Johnson 1996-1998 Historical Works © Matthew D. Friend 2017