The United States and Canada share the North American Numbering Plan (NANP). Numbers are +1 NPA-NXX-XXXX — a 3-digit NPA (area code) followed by a 7-digit local number. Toll-free numbers use NPAs 800, 833, 844, 855, 866, 877, 888. Major cities below — DIDHub stocks numbers in nearly every US NPA.
212/646/917/332New York City, NY
213/323/310/424Los Angeles, CA
312/773/872Chicago, IL
415/628San Francisco, CA
510/341Oakland / Berkeley, CA
305/786Miami, FL
202Washington, DC
617/857Boston, MA
404/470/678/770Atlanta, GA
713/281/832/346Houston, TX
214/469/972/945Dallas / Fort Worth, TX
512/737Austin, TX
210/726San Antonio, TX
206Seattle, WA
503/971Portland, OR
702/725Las Vegas, NV
619/858San Diego, CA
215/267/445Philadelphia, PA
313/679Detroit, MI
612/952/763Minneapolis / St. Paul, MN
303/720Denver, CO
602/480/623Phoenix, AZ
314/636St. Louis, MO
216/440Cleveland, OH
614/380Columbus, OH
513Cincinnati, OH
704/980Charlotte, NC
919/984Raleigh, NC
615/629Nashville, TN
901Memphis, TN
504New Orleans, LA
407/689Orlando, FL
813/727Tampa, FL
904Jacksonville, FL
808Hawaii (statewide)
907Alaska (statewide)
800/833/844/855Toll-free (national)
866/877/888Toll-free (national)