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Area codes grow in ascending order from left to right.

201 - New Jersey (Newark) 202 - Washington, DC 203 - Connecticut 205 - Alabama 206 - Washington (Seattle)
 207 - Maine  208 - Idaho  209 - California (Fresno)  210 - Texas (San Antonio)  212 - New York 
 213 - California (Los Angeles)  214 - Texas (Dallas)  215 - Pennsylvania (Phila.)  216 - Ohio (Cleveland)  217 - Illinois (Springfield)
 218 - Minnesota (Duluth)  219 - Indiana (South Bend) 301 - Maryland (Bethesda)   302 - Delaware 303 - Colorado (Denver) 
 304 - West Virginia  305 - Florida (Miami)  307 - Wyoming  308 - Nebraska (North Platte)  309 - Illinois (Peoria)
 310 - California (Los Angeles)  312 - Illinois (Chicago)  313 - Michigan (Detroit)  314 - Missouri (St. Louis)  315 - New York (Syracuse)
 316 - Kansas (Wichita)  317 - Indiana (Indianapolis)  318 - Louisiana (Shreveport)  319 - Iowa (Dubuque)  401 - Rhode Island
 402 - Nebraska (Omaha)  403 - Alberta, Northwest Territories, and Yukon  404 - Georgia (Atlanta) 405 - Oklahoma (Oklahoma City)   406 - Montana
 407 - Florida (Orlando)  408 - California (San Jose)  409 - Texas (Galveston)  410 - Maryland (Baltimore)  412 - Pennsylvania (Pittsburgh)
 413 - Massachusetts (Springfield)  414 - Wisconsin (Milwaukee)  415 - California (San Francisco)  416 - Ontario (Toronto) 417 - Missouri (Springfield) 
 418 - Quebec (Quebec)  419 - Ohio (Toledo)  423 - Tennessee (Knoxville)  501 - Arkansas  502 - Kentucky (Louisville)
 503 - Oregon (Portland)  504 - Louisiana (New Orleans)   505 - New Mexico  506 - New Brunswick  507 - Minnesota (Rochester)
  508 - Massachusetts (Worcester)   509 - Washington (Spokane)  510 - California (Oakland) 512 - Texas (Austin)   513 - Ohio (Cincinnati)
 514 - Quebec (Montreal)  515 - Iowa (Des Moines)  516 - New York (Long Island)  517 - Michigan (Lansing)  518 - New York (Albany)
 519 - Ontario (London)  541 - Oregon (Eugene)      
 601 - Mississippi  602 - Arizona  603 - New Hampshire  604 - British Columbia  605 - South Dakota
 606 - Kentucky (Newport)  607 - New York (Ithaca)  608 - Wisconsin (Madison)  609 - New Jersey (Trenton)  610 - Pennsylvania (Reading)
 612 - Minnesota (Minneapolis)  614 - Ohio (Columbus)  615 - Tennessee (Nashville)  616 - Michigan (Grand Rapids)  617 - Massachusetts
 618 - Illinois (Centralia)  619 - California (San Diego)  701 - North Dakota  702 - Nevada  703 - Virginia (Arlington)
 704 - North Carolina (Charlotte)  705 - Ontario (North Bay)  706 - Georgia  707 - California (Santa Rosa)  708 - Illinois (Des Plaines)
 712 - Iowa (Council Bluffs)  713 - Texas (Houston) 714 - California (Orange County)   715 - Wisconsin (Eau Clair)  716 - New York (Buffalo)
 717 - Pennsylvania (Harrisburg)  718 - New York (Brooklyn, Bronx, Queens, Staten Island)  719 - Colorado (Colorado Springs)  801 - Utah  802 - Vermont
 803 - South Carolina  804 - Virginia (Richmond)  805 - California (Bakersfield)  806 - Texas (Amarllo)  807 - Ontario
 808 - Hawaii  810 - Michigan (Pontiac)  812 - Indiana (Evansville)  813 - Florida (Fort Myers)  814 - Pennsylvania (Erie)
 815 - Illinois (Rockford)  816 - Missouri (Kansas City)  (817) Texas (Fort Worth)  818 - California (Los Angeles)  819 - Quebec and Northwest Territories
 901 - Tennessee (Memphis)  902 - Nova Scotia  903 - Texas (Dallas)  904 - Florida (Jacksonville)  905 - Ontario (Toronto)
 906 - Michigan (Marquette)  907 - Alaska  908 - New Jersey (Elizabeth)  909 - California (San Bernardino)  910 - North Carolina (Winston-Salem)
 912 - Georgia (Savannah)  913 - Kansas (Topeka)  914 - New York (White Plains)  915 - Texas (El Paso) 916 - California (Sacramento) 
917 - New York (cellular)   918 - Oklahoma (Tulsa)  919 - North Carolina  931 - Tennessee (Middle Tennessee)