The Pioneer Trails Region has forty (40) incorporated cities within its four counties. Size, population and population density are demonstrated in table 2.1 shown in this section. Johnson County is the largest county comprising of 830.4 square miles but Lafayette County, with 629.3 square miles, has the largest number of municipalities. The communties of Alma, Aullville, Bates City, Blackburn, Concordia, Corder, Dover, Emma, Higginsville, Lake Lafayette, Lexington, Mayview, Napoleon, Odessa, Waverly and Wellington are in Lafayette County. Lexington serves as the county seat. The population density for Lafayette County is 53.0 persons per square mile.
Johnson County is home to Centerview, Chilhowee, Holden, Kingsville, Knob Noster, Leeton, Warrensburg and Whiteman Air Force Base with Warrensburg serving as the county seat. The population density of Johnson County is the largest in the region (63.3).
Pettis County has the second largest population density (61.6) in the four county region but has the smallest number of municipalities. Green Ridge, Houstonia, Hughesville, LaMonte, Sedalia and Smithton are all located in Pettis County. Sedalia is the county seat. Pettis County covers 684.8 square miles.
Saline County is the second largest county when measured by square miles (755.6) but has the smallest population density at 30.9 persons per square mile. Saline counties municipalities include: Arrow Rock, Gillam, Grand Pass, Malta Bend, Marshall, Miami, Mount Leonard, Nelson, Slater and Sweet Springs. Marshall serves as the county seat.