Hillman Garage Annapolis
Use 123 Main St., Annapolis, as a GPS address. That's actually the address of the CVS on Main St., your geographical marker to turn immediately left, from Main St., into the alley leading to the Hillman garage. You can also turn into the garage (a left) from Duke of Gloucester St., but that is the secondary entrance, and sometimes closed. The garage is cash only, no credit cards.
A word of warning...the Hillman garage occasionally fills up, especially during legislative sessions or other big happenings in town, and though you might see cars leaving the garage with the "no vacancy" sign lit, that doesn't mean you should wait in line to get in. A certain percentage of spaces are reserved for monthly pass-holders, and you don't want one of these folks behind you to be blocked. (It could be me!)
A Plan B could be the other city garage, entrance off Calvert St., up near West St./Church Circle area. More of a hike, but same deal as Hillman.
And, the Annapolis parking patrol is ever-vigilant about the two-hour parking zone, a major source of ticket revenue for the City. There are some longer-than-two-hour spots well down King George St. toward St. John's College. Be sure and read the green signs. Residents, who have the sticker to park on-street 24/7, don't hesitate to call in about sinners, unwitting though they may be.