I've always found daycare/preschool near home because I live in VA and work in DC and it's almost impossible to find care in DC, especially if you're not government/ agency.
When I lived in Fairfax, it was harder having her way out there - a few times I raced against the clock to get her, and she was there 10 hours/day. So we moved to Arlington, where she has a 9-hour day and I'm not as rushed to pick her up. what helps: having a couple of people authorized to pick up your child if something goes wrong. (like the day the guy jumped off the platform at Clarendon, killing metro service.)