Its Pikesville/North Mt. Washington - a shopping center called Shops at Quarry Lakes on Greenspring Avenue. Best bagels in town, great tuna salad, and great, inventive, h omemade cream cheese spreads.

There are other great restaurants there: Jasmine, Ciao! - and great grocery, The Fresh Market, too.

Direct location: On Greenspring Avenue, between Old Court Rd and Smith Avenue.

Quarry Lake and the Pikesville Post Office are both in the 21208 zip code.

Zipcodes aside, I would call that area Greenspring.

So such thing as North Mt. Washington. Mt. Washington has clearly defined boundaries, and all of it lies within the Baltimore City limits. Ity's a nice neighborhood, so I understand why people near (but not in) Mt. Washington want to use the name, but sorry folks, you live in Cheswolde, Pikesville, etc.

Though realtors (oops, left off the TM and didn't capitalize, thanks DW for focusing us all on intellectual property rights) call anything Randallstown to Colonial Village to Pimlico Pikesville, it actually is. It's in the Pikesville HS region, though in 21209, which is half Mt. Washington. It was a major subject of a Pikesville-umbrella'd group of community orgs like the Pikesville-Greesnpring Community Coalition and residents vehemently opposed to its development by operators who did not care about the impact on the neighbors or the ocean-deep lake they say is safely fenced off from curious youth. Some neighbors are still put off by this, the increased traffic, skeptical of the warmth factor or staying power of the businesses, though relieved the periodic quarrying detonations are gone.

Ocean-deep lake? Really?

From Wikipedia:
The center of the development features is 40-acre (160,000 m2) lake, which is 500 feet (150 m) deep, one of the deepest lakes in the state of Maryland [3].
The developers, Obrecht et al, did not have the vision or financing to fill in the old mining operation, one of many reasons the development was ill-advised and opposed. Speaking as as a once-industrious former teenager able to enter swimming operations deemed secure, it's only a matter of time before something happens. And the bottom reportedly is full of old metal equipment.

and Ciao Pizza Bistro Italiano are here, too.

So they are just letting computers make up restaurant names now?

It is actually called "Ruths' Chris Ciao Pizza Bistro Italiano based on the novel Push by Sapphire"

Quarry Town? Yeah, that where my boss, Mr. Slate lives

I think Slate was replaced by J. J. Granite.

@Abe - Calvin Trillin, a Baltimore non-imported crabcake fan, skewered dumb restaurant names, running from places called La Maison de la Casa House.

Here's a little story about the quarry's original use. For 13 years I served as Rector of Christ Church, Rock Spring Parish, in Forest Hill. In 2001 we built a parish hall annex and budgeted a little bit of money to buy some stone for the main entryway as a way of connecting it visually with the stone church and tower. The builder asked around and was told that the stone looked a lot like that provided by a Baltimore County quarry. He got the name and called them, asking if he could get some samples to match with the church. The nice office person put him on hold and returned in a minute with both of our previous billing statements: the first for the 1875 redesign of the church and the second for the 1901 construction of the tower! When my current billet was building an undercroft chapel 25+ years ago they also were able to get stone from the same quarry that matched the 1896 construction of the main building. I wish all of the folks well in their commercial endeavors -- but the Episcopal Church will miss the good stone!