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National Register landmarks
Every county page lists National Register of Historic Places properties from NPS data (when listed for that county), with maps when coordinates are public. This site currently indexes 100,122 listed places.
Start with counties that have especially dense landmark coverage:
| County | State | Listed places |
|---|---|---|
| Middlesex County | MA | 1,349 |
| District of Columbia | DC | 707 |
| Worcester County | MA | 698 |
| St. Louis County | MO | 666 |
| Multnomah County | OR | 640 |
| Philadelphia County | PA | 633 |
| Los Angeles County | CA | 629 |
| Cook County | IL | 623 |
| New York County | NY | 607 |
| Jefferson County | KY | 533 |
| Essex County | MA | 493 |
| Cuyahoga County | OH | 456 |
| Hartford County | CT | 455 |
| Maricopa County | AZ | 452 |
| Providence County | RI | 448 |
| New Castle County | DE | 421 |
| Baltimore County | MD | 420 |
| Hamilton County | OH | 410 |
| Jackson County | MO | 401 |
| Salt Lake County | UT | 394 |
| Bristol County | MA | 390 |
| Wayne County | MI | 383 |
| Pulaski County | AR | 381 |
| Franklin County | OH | 365 |