List of The Fastest Growing Counties in the United States (2010 to 2022) |
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| Map Key | County Name | Metro Area/Region | Population (2022) | Population Growth Rate |
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| Fairfield County, Connecticut | Metro New York City | 918,892 | 4.43% |
| Hartford County, Connecticut | Hartford-New Haven Area | 893,504 | 0.61% |
| Saint Louis County, Missouri | Metro St. Louis | 999,147 | 0.52% |
| New Haven County, Connecticut | Hartford-New Haven Area | 860,995 | 0.27% |
| Middlesex County, Connecticut | Hartford-New Haven Area | 165,639 | -0.86% |
| Windham County, Connecticut | Hartford-New Haven Area | 118,046 | -1.7% |
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| Tolland County, Connecticut | Hartford-New Haven Area | 152,137 | -1.9% |
| New London County, Connecticut | Hartford-New Haven Area | 273,723 | -2.01% |
| Litchfield County, Connecticut | Hartford-New Haven Area | 189,277 | -2.5% |
| Cabo Rojo Municipio, Puerto Rico | | 50,866 | -7.38% |
| Juana Diaz Municipio, Puerto Rico | | 50,695 | -8.29% |
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| Guaynabo Municipio, Puerto Rico | | 97,639 | -8.32% |
| Vega Baja Municipio, Puerto Rico | | 59,444 | -8.8% |
| Arecibo Municipio, Puerto Rico | | 96,176 | -9.01% |
| Trujillo Alta Municipio, Puerto Rico | | 74,655 | -9.49% |
| Aguadilla Municipio, Puerto Rico | | 60,714 | -9.59% |
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| Toa Alta Municipio, Puerto Rico | | 74,178 | -9.74% |
| Caguas Municipio, Puerto Rico | | 142,549 | -10.95% |
| Bayamon Municipio, Puerto Rico | | 207,337 | -11.02% |
| Carolina Municipio, Puerto Rico | | 176,157 | -12.42% |
| Humacao Municipio, Puerto Rico | | 58,333 | -12.95% |
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| Rio Grande Municipio, Puerto Rico | | 54,203 | -13.34% |
| San Juan Municipio, Puerto Rico | | 393,633 | -13.42% |
| Toa Baja Municipio, Puerto Rico | | 89,294 | -15.98% |
| Ponce Municipio, Puerto Rico | | 165,602 | -17.34% |
| Mayaguez Municipio, Puerto Rico | | 88,664 | -17.96% |