Year	Pennington County	Rapid City
2005	93,200	66,000
2004	92,500	60,262
2000	88,117	59,607
1990	81,343	54,523
1980	70,135	46,492
1970	59,349	43,836
1960	58,195	42,399
1950	34,053	25,310

Male Population:  46,288          Male Median Age:  34

Female Population:  46,955          Female Median Age: 37

Number of Households: 37,000            Average Household Size:  2.45

Median Household EBI*: $35,350             Average Household EBI*:  $45,325

*EBI (Effective Buying Income) is disposable personal income: that amount of gross income available after taxes, to purchase goods and services.   

Information from www.rapiddevelopment.com