These are some popular postcard collecting topics. Don't limit yourself to these topics—just collect anything that interests you. There are postcards for any taste or budget. Many people collect topics related to their profession or other hobbies.

• Advertising
• Agriculture
• Amusement Parks
• Animals—cats, dogs, wild, zoo, alligators, cows, pigs, rabbits, etc.
• Architecture
• Art
• Art Deco
• Artist Signed
• Beer
• Calendars
• Children
• Colleges and Universities
• Comics
• Cowboys
• Crafts—woodworking, folk art, quilts, jewelry, baskets, decorative painting, knitting, etc.
• Drinking
• Entertainment—entertainers, theaters, shows
• Ethnic
• Exaggeration
• Expositions and World's Fairs
• Events
• Fairs
• Fashion
• Fantasy
• Fishing
• Food
• Gambling
• Greetings—general, birthday, mottos
• Historical—places, events
• Holidays—New Years, Valentines, St. Patrick's Day, Easter, Fourth of July, Halloween, Thanksgiving, Christmas
• Homes—exteriors, interiors, decoration, furniture
• Hospitals
• Hotels
• Hunting
• Indians
• Industry
• Interiors
• Large Letters
• Maps
• Military—WWI, WWII, Army, Navy, comics
• Motels
• National Parks
• Nature—birds, wildflowers, insects, trees, etc.
• Novelty
• Occupations
• Parades
• Patriotic
• Photography
• Political—action, elections, politicians, presidents
• Postal—post offices, mail, stamps, postcards
• Posters
• Real Photos
• Religious
• Restaurants
• Risque
• Rivers
• Roadside
• Romantic
• Royalty
• Scouting
• Snowmen
• Space
• Sports—baseball, football, stadiums, skiing, skating, golf, etc.
• Statues
• Stores
• Street scenes
• Tacky
• Transportation—autos, trains, planes, buses, trolleys, ships, highways, depots, airports
• Travel
• U.S. States
• U.S. Towns
• Women
• Women's Rights