If suburbs will do, there are a bunch of outstanding options, including these three:
The Quaker Consortium LACs:
- Swarthmore
- Haverford
- Bryn Mawr
The fourth member of the consortium is Penn.
The three LACs are quite close to Philadelphia. There are other suburban LACs but these combine proximity to their city and academic strength as well as any and better than most.
As for top-notch LACs in big cities… I’m repeating some of these:
- U of Richmond
- Reed
- Trinity College (CT)
- Barnard (part of Columbia U)
- Occidental
- Rhodes
- Colorado College
- Macalester
Those are all excellent LACs.