| Site | State | Type | Population |
|---|---|---|---|
| Kalama, WA | Washington | City | 2959 |
| Kalamazoo County, MI | Michigan | County | 261108 |
| Kalamazoo, MI | Michigan | City | 76106 |
| Kalispell, MT | Montana | City | 26110 |
| Kanabec County, MN | Minnesota | County | 16024 |
| Kanawha County, WV | West Virginia | County | 181014 |
| Kane County, IL | Illinois | County | 531756 |
| Kankakee, IL | Illinois | City | 25818 |
| Kansas City, KS | Kansas | City | 153014 |
| Kansas City, MO | Missouri | City | 508394 |
| Kaplan, LA | Louisiana | City | 4277 |
| Kapolei, HI | Hawaii | City | 21541 |
| Karns, TN | Tennessee | City | 3536 |
| Kasson, MN | Minnesota | City | 6931 |
| Katy, TX | Texas | City | 20202 |
| Kauai County, HI | Hawaii | County | 73454 |
| Kay County, OK | Oklahoma | County | 43732 |
| Kearney, NE | Nebraska | City | 33464 |
| Keene, NH | New Hampshire | City | 22823 |
| Keizer, OR | Oregon | City | 39157 |
| Kelso, WA | Washington | City | 12880 |
| Kenai, AK | Alaska | City | 7742 |
| Kennebec County, ME | Maine | County | 124486 |
| Kennebunk, ME | Maine | City | 11622 |
| Kenner, LA | Louisiana | City | 65202 |
| Kennesaw, GA | Georgia | City | 33049 |
| Kennewick, WA | Washington | City | 84488 |
| Kenosha County, WI | Wisconsin | County | 168734 |
| Kenosha, WI | Wisconsin | City | 99868 |
| Kent County, DE | Delaware | County | 184149 |
| Kent County, MI | Michigan | County | 652617 |
| Kent, OH | Ohio | City | 27751 |
| Kent, WA | Washington | City | 145424 |
| Kenton County, KY | Kentucky | County | 166552 |
| Kern County, CA | California | County | 917673 |
| Kerr County, TX | Texas | County | 52598 |
| Kershaw County, SC | South Carolina | County | 66130 |
| Ketchikan, AK | Alaska | City | 8228 |
| Kettering, OH | Ohio | City | 57377 |
| Key West, FL | Florida | City | 26527 |
| Keyport, NJ | New Jersey | City | 7023 |
| Kihei, HI | Hawaii | City | 22749 |
| Killeen, TX | Texas | City | 145686 |
| King County, WA | Washington | County | 2326040 |
| King of Prussia, PA | Pennsylvania | City | 22028 |
| Kingman, AZ | Arizona | City | 32689 |
| Kings County, CA | California | County | 151090 |
| Kings Mountain, NC | North Carolina | City | 10885 |
| Kingsport, TN | Tennessee | City | 55582 |
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