Calgary, Alberta, Canada.
The closest city to Mt. Hood in the United States is Government Camp, Oregon.
Washington, D.C. is closest to Annapolis, the capital of Maryland.
Baltimore, Maryland
Calgary, Cananda
McAllen, TX
I'll assume you mean "Cities in the US", since it's impossible to have "countries in the US". There really aren't any major US cities close to Calgary. Calgary's fairly north of the border in the first place, and on the other side of the border is northern Montana, where there isn't much in the way of big towns. Based on Google Maps, I'd say the closest citites to Calgary would be Spokane WA, Missoula MT, Great Falls MT, or Helena MT. The closest major city would probably be Seattle WA, but it's a bit of a stretch. Sorry if that's not what you're asking.
The major North American city closest to the coordinates 35 N 107 W is Albuquerque, New Mexico in the United States.
Annapolis, the capital city of Maryland, is located 29 miles from Washington D.C., the capital city of the United States. Annapolis is the closest state capital.
The city in the United States closest to the Grand Cayman Islands is Miami, Florida. The distance between Miami and Grand Cayman is approximately 400 miles (about 640 kilometers) across the Caribbean Sea. Miami serves as a major hub for flights to the islands, making it easily accessible for travelers.
The closest capital city to the coordinates 41 degrees north and 74 degrees west is Hartford, the capital of Connecticut in the United States.
The area of megalopolis growth closest to the city of Hays is the Kansas City metropolitan area, located to the east of Hays. This region is a major hub for economic activities, transportation networks, and cultural attractions in the central United States.