| Site | State | Type | Population |
|---|---|---|---|
| Aberdeen, MD | Maryland | City | 16889 |
| Aberdeen, OH | Ohio | City | 1552 |
| Aberdeen, WA | Washington | City | 17013 |
| Abilene, TX | Texas | City | 125182 |
| Ackley, IA | Iowa | City | 1576 |
| Ada County, ID | Idaho | County | 511931 |
| Ada, OK | Oklahoma | City | 16842 |
| Adams County, CO | Colorado | County | 504108 |
| Adams County, IL | Illinois | County | 65670 |
| Adams County, PA | Pennsylvania | County | 103852 |
| Aiken County, SC | South Carolina | County | 165829 |
| Akron, OH | Ohio | City | 189387 |
| Alabaster, AL | Alabama | City | 33176 |
| Alachua County, FL | Florida | County | 269043 |
| Alamance County, NC | North Carolina | County | 162391 |
| Alameda County, CA | California | County | 1649000 |
| Alamogordo, NM | New Mexico | City | 31652 |
| Albany County, NY | New York | County | 313743 |
| Albany, GA | Georgia | City | 72634 |
| Albany, NY | New York | City | 98617 |
| Albany, OR | Oregon | City | 54442 |
| Albert Lea, MN | Minnesota | City | 17804 |
| Albertville, AL | Alabama | City | 22386 |
| Albuquerque, NM | New Mexico | City | 562599 |
| Alcoa, TN | Tennessee | City | 8449 |
| Alexandria, LA | Louisiana | City | 47012 |
| Alexandria, VA | Virginia | City | 157613 |
| Aliquippa, PA | Pennsylvania | City | 9004 |
| Allegany County, MD | Maryland | County | 67729 |
| Allegheny County, PA | Pennsylvania | County | 1218000 |
| Allegheny Township, PA | Pennsylvania | City | 8068 |
| Allen County, IN | Indiana | County | 388608 |
| Allen County, OH | Ohio | County | 102351 |
| Allentown, PA | Pennsylvania | City | 125845 |
| Alliance, NE | Nebraska | City | 8403 |
| Alliance, OH | Ohio | City | 21801 |
| Alpena, MI | Michigan | City | 9987 |
| Alpharetta, GA | Georgia | City | 65818 |
| Altamonte Springs, FL | Florida | City | 39942 |
| Alton, IL | Illinois | City | 25422 |
| Altoona, PA | Pennsylvania | City | 43669 |
| Amarillo, TX | Texas | City | 201234 |
| Ambridge, PA | Pennsylvania | City | 6869 |
| American Fork, UT | Utah | City | 33337 |
| Amery, WI | Wisconsin | City | 2819 |
| Ames, IA | Iowa | City | 66361 |
| Amesbury, MA | Massachusetts | City | 17366 |
| Amherst, OH | Ohio | City | 12193 |
| Amsterdam, NY | New York | City | 18187 |
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