Founded in 1822, Clay County is one of 114 counties in the state of Missouri. Historically, Clay County was formed from Ray County. The city of Liberty is the county seat. With FIPS code of 47, Clay County has a population of 255,518 and area of 396 square miles (1,026 km2).
List of all cities in Clay County, MO alphabetically
| City/Town | Postal Code | Area Code |
| Avondale, MO | 64117 | 816/975 |
| Birmingham, MO | 64161 | 816/975 |
| Claycomo, MO | 64119 | 816/975 |
| Crystal Lakes, MO | 64024 | 816/975 |
| Excelsior Springs, MO | 64024 | 816/975 |
| Gladstone, MO | 64116 | 816/975 |
| 64118 | 816/975 | |
| 64119 | 816/975 | |
| 64155 | 816/975 | |
| 64156 | 816/975 | |
| 64165 | 816/975 | |
| 64166 | 816/975 | |
| 64188 | 816/975 | |
| Holt, MO | 64048 | 816/975 |
| Homestead Village, MO | 64024 | 816/975 |
| Kansas City, MO | 64116 | 816/975 |
| 64117 | 816/975 | |
| 64118 | 816/975 | |
| 64119 | 816/975 | |
| 64144 | 816/975 | |
| 64155 | 816/975 | |
| 64156 | 816/975 | |
| 64157 | 816/975 | |
| 64158 | 816/975 | |
| 64161 | 816/975 | |
| 64165 | 816/975 | |
| 64166 | 816/975 | |
| 64167 | 816/975 | |
| 64188 | 816/975 | |
| Kansas City North, MO | 64117 | 816/975 |
| Kearney, MO | 64060 | 816/975 |
| Liberty, MO | 64068 | 816/975 |
| 64069 | 816/975 | |
| Missouri City, MO | 64072 | 816/975 |
| Mosby, MO | 64024 | 816/975 |
| 64073 | 816/975 | |
| North Kansas City, MO | 64116 | 816/975 |
| Oakview, MO | 64118 | 816/975 |
| Paradise, MO | 64089 | 816/975 |
| Philatelic Distribution Center, MO | 64144 | 816/975 |
| Pleasant Valley, MO | 64068 | 816/975 |
| Randolph, MO | 64117 | 816/975 |
| 64161 | 816/975 | |
| Smithville, MO | 64089 | 816/975 |
| Village of Oakview, MO | 64118 | 816/975 |
| Wood Heights, MO | 64024 | 816/975 |