Santa Fe is the oldest of the U.S. state capitals. It is the capital of New Mexico and is notably the highest-elevation state capital in the country. The clue you mentioned, “Like Santa Fe, among U.S. capitals,” typically resolves to OLDEST in recent crosswords. If you’d like, I can tailor a quick crossword- friendly guide or provide additional clues related to state capitals and their distinctive facts (elevation, age, or founding dates).