500-599
500: Personal Communications Services
501: Arkansas (Little Rock, Hot Springs, and much of central Arkansas, but not Pine Bluff.)
- Originally covered all of Arkansas; split to create 870 (1997) and 479 (2002).
502: Kentucky (Louisville, Frankfort, Shelbyville, Bardstown, and most of north-central Kentucky)
- Originally covered all of Kentucky; split to create 606 in 1954 and 270 in 1999.
503: Oregon (Portland, Salem, Hillsboro, St. Helens, Tillamook, Astoria and most of northwestern Oregon)
- Originally covered all of Oregon; split in 1995 to create 541.
- Partially overlain by 971 in 2000, excluding Clatsop County and Tillamook County. Complete overlay implemented in 2008.
504: Louisiana: New Orleans metropolitan area
- Originally covered all of Louisiana; split to create 318 (1957), 225 (1998) and 985 (2001). New Orleans and Baton Rouge are no longer in the same area code.
505: New Mexico: (Albuquerque, Santa Fe, Farmington, Gallup, and all of northwestern New Mexico, and part of central New Mexico).
- Originally covered all of New Mexico; split in 2007 to create 575.
506: New Brunswick
- Created in 1955 by split from 902.
- Split in 1962 to create 709.
507: Minnesota (Rochester, Mankato, Austin, Marshall, Winona and most of southern Minnesota)
- Created in 1954 by split from 612.
508: Massachusetts (Worcester, New Bedford, Fall River, Cape Cod, and most of southeastern Massachusetts)
- Created in 1988 by split from 617.
- Split in 1997 to create 978.
- Overlain by 774 in 2001.
509: State of Washington (all of eastern Washington, including Spokane, Ellensburg, Pullman, the Tri-Cities area, Walla Walla, Wenatchee, and Yakima.)
- Created in 1957 by split from 206.
510: California (Oakland, Fremont, Hayward, Richmond, Berkeley and Alameda)
- Created in 1991 by split from 415.
- Split in 1998 to create 925.
511: Used as a state or local transportation or transit information hub. Otherwise used to direct local police non-emergency services in some communities.
512: Texas (Austin, San Marcos, and parts of central Texas)
- Split to create 210 (1992) and 361 (1999).
513: Ohio (Cincinnati, Middletown, Hamilton, Lebanon, and parts of southern and southwestern Ohio. This area code formerly also included Dayton.)
- Split in 1996 to create 937.
- The proposed overlay with area code 283 has been postponed.
514: Province of Quebec: the entire Island of Montreal, Île Perrot, and Île Bizard
- Split to create 819 (1957) and 450 (1998).
- Overlain by 438 in 2006.
515: Iowa (Des Moines, Ames, Fort Dodge, Jefferson, Indianola and most of north-central Iowa)
- Split in 2000 to create 641.
516: New York State (Nassau County, Hempstead, Long Beach, Great Neck, etc.)
- Created in 1951 by split from 914.
- Split in 1999 to create 631.
517: Michigan (Lansing, Jackson, Charlotte, Deerfield, Addison, and most of south-central Michigan)
- Split in 2000 to create 989.
518: New York State (Albany, Schenectady, Plattsburgh, Saranac Lake, Lake George, Westport, and most of northeastern New York State)
519: Province of Ontario (London, Windsor, Kitchener-Waterloo, Cambridge, and most of southwestern Ontario)
- Created in 1953 from parts of 416 and 613.
- Split in 1957 to create part of 705.
- Overlain by 226 in 2006.
520: Arizona (Tucson, Nogales, Fort Huachuca, and most of southeastern Arizona)
- Created in 1995 by split from 602.
- Split in 2001 to create 928.
521: Reserved for Personal Communications Services-effective July 2011
522: Reserved for Personal Communications Services
523-529: Reserved for Personal Communications Services-effective July 2011
530: California (Redding, Auburn, Chico, Davis, Lake Tahoe, Placerville, Susanville, Truckee, Yreka, and most of northeastern California)
- Created in 1997 by split from 916.
531: Nebraska (Omaha, Lincoln, Norfolk, Superior, and most of eastern Nebraska)
- Overlain on 402 in 2011.
532: Reserved for Personal Communications Services-effective July 2011
533: Personal Communications Services
534: Wisconsin—Overlaid 715 in 2010.
535 – 537: not used
538: Reserved for Personal Communications Services-effective July 2011
539: Oklahoma (Tulsa, Bartlesville, McAlester, Muskogee, Henryetta and northeastern Oklahoma)
- Overlain on 918 in 2011.
540: Virginia (Fredericksburg, Roanoke, Blacksburg, Harrisonburg, Lexington, Staunton, Winchester, and parts of north-central Virginia)
- Created in 1995 by split from 703.
- Split in 2001 to create 276.
541: Oregon (Eugene, Bend, Corvallis, Medford, Pendleton, and all of Oregon except metropolitan northwestern Oregon, including Portland, Salem, Astoria, etc.)
- Created in 1995 by split from 503.
- Overlain in 2010 by 458.
542-543: Reserved for Personal Communications Services-effective July 2011
544: Personal Communications Services
545: Reserved for Personal Communications Services-effective July 2011
546: not used
547: Reserved for Personal Communications Services-effective July 2011
548: not used
549: Reserved for Personal Communications Services-effective July 2011
550: not used
551: New Jersey
- Overlain onto 201 in 2001.
552-554: Reserved for Personal Communications Services-effective July 2011
555: Reserved for directory assistance applications.
- This is not the same as the 555 exchange, which is used for long-distance directory assistance or for fictitious purposes, such as on TV and in films.
556: Reserved for Personal Communications Services-effective July 2011
557: Missouri—planned overlay for 314
558: not used
559: California (Fresno, Hanford (Calif.), Madera, Tulare, Visalia, and parts of the Central Valley of California.
- Created in 1998 by split from 209.
560: not used
561: Florida (Palm Beach County, including Palm Beach, West Palm Beach, Boca Raton, Boynton Beach, etc.)
- Created in 1996 by split from 407.
- Split to create 772.
562: California (Long Beach, Whittier, Norwalk, La Habra, Lakewood, Pico Rivera, and most of southeastern Los Angeles County)
- Created in 1997 by split from 310.
563: Iowa (Davenport, Dubuque, Clinton, Bettendorf, and most of eastern and northeastern Iowa)
- Created in 2001 by split from 319.
564: State of Washington (Western Washington)—a proposed overlay area code for 206, 253, 360 and 425
565: not used
566: Reserved for Personal Communications Services
567: Ohio
- Overlain on 419 in 2002.
568: not used
569: Reserved for Personal Communications Services-effective July 2011
570: Pennsylvania (Scranton, Wilkes-Barre, Bloomsburg, Danville, Nanticoke, Williamsport, and most of northeastern Pennsylvania)
- Created in 1998 by split from 717.
- Scheduled to be overlain by 272 in 2013.
571: Virginia
- Overlain on 703 in 2000.
572: not used
573: Missouri (Columbia, Jefferson City, Hannibal, Cape Girardeau, Farmington, Lake of the Ozarks, Poplar Bluff, and most of eastern Missouri excluding St. Louis County and the City of St. Louis)
- Created in 1996 by split from 314.
574: Indiana (South Bend, Elkhart, Goshen, and most of north-central Indiana)
- Created in 2002 by split from 219.
575: New Mexico (Las Cruces, Roswell, Carlsbad Caverns National Park, Socorro, Taos, Truth or Consequences; excludes central (Albuquerque and its suburbs) and northwestern New Mexico)
- Created in 2007 by split from 505.
576: not used
577: Reserved for Personal Communications Services
578: Reserved for Personal Communications Services-effective July 2011
579: Province of Quebec (central southern Quebec including the city of Laval and other suburbs of Montreal but excluding the City of Montreal)
- Overlain on 450 in 2010.
580: Oklahoma (Ponca City, Ardmore, Enid, Lawton, Elk City, and most of southern and western Oklahoma)
- Created in 1997 by split from 405.
581: Province of Quebec
- Overlain on 418 in 2008.
582: Pennsylvania—Relief of 814, effective 2012; currently proposed as a split including northwestern Pennsylvania around Erie
583–584: not used
585: New York State (Rochester, Batavia, and much of western New York State)
- Created in 2002 by split from 716.
586: Michigan (Warren, Sterling Heights, and Macomb County)
- Created in 2001 by split from 810.
587: Alberta
- Overlain on 403 and 780 in 2008.
588: Reserved for Personal Communications Services
589: Reserved for Personal Communications Services-effective July 2011
590–599: Reserved for potential North American Numbering Plan expansion
Read more about this topic: List Of North American Numbering Plan Area Codes