| County : | Plymouth County |
| State : | Iowa (IA) |
| Land Area : | 862.89 sq mi |
| Water Area : | 0.84 sq mi |
| Latitude : | 42.7375854 |
| Longitude : | -96.2158638 |
| Population (2010): | 24,986 |
| Population Estimate (2012) : | 24,911 |
| Population Density : | 28.96/sq mi |
| Housing Units (2012) : | 10,550 |
| Median Household Income (2012) : | $58,916 (Iowa : $51,129, USA : $53,046) |
| Median Family Income (2012) : | $72,380 (Iowa : $64,772, USA : $64,585) |
| Median House Price (2012) : | $128,300 (Iowa : $123,000, USA : $181,400) |
Plymouth County Cities / Towns
| Akron City (1,486) | Brunsville City (151) | Craig City (89) |
| Hinton City (928) | Kingsley City (1,411) | Le Mars City (9,826) |
| Merrill City (755) | Oyens City (103) | Remsen City (1,663) |
| Sioux City (82,684) | Struble City (78) | Westfield City (132) |
Plymouth County Zip Codes
| 51001 (2,432) | 51008 (151) | 51022 (789) |
| 51024 (2,070) | 51027 (1,260) | 51028 (2,065) |
| 51031 (12,336) | 51038 (1,535) | 51050 (2,631) |
| 51062 (526) | 51108 (5,566) | 51109 (3,098) |