Baldwin is an

unincorporated community An unincorporated area is a region that is not governed by a local municipal corporation. Widespread unincorporated communities and areas are a distinguishing feature of the United States and Canada. Most other countries of the world either have ...

Baltimore County Baltimore County ( , locally: or ) is the third-most populous county in the U.S. state of Maryland and is part of the Baltimore metropolitan area. Baltimore County (which partially surrounds, though does not include, the independent City of ...

Maryland Maryland ( ) is a state in the Mid-Atlantic region of the United States. It shares borders with Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; and Delaware and the Atlantic Ocean to ...

, United States. The

USPS The United States Postal Service (USPS), also known as the Post Office, U.S. Mail, or Postal Service, is an independent agency of the executive branch of the United States federal government responsible for providing postal service in the ...

has assigned Baldwin the ZIP Code 21013.Zip Code Lookup
/ref> Until 1958, this community was served by the

Maryland and Pennsylvania Railroad The Maryland and Pennsylvania Railroad , familiarly known as the "Ma and Pa", was an American short-line railroad between York and Hanover, Pennsylvania, formerly operating passenger and freight trains on its original line between York and Balt ...

at milepost 18.4. Hidden Valley Farm was listed on the

National Register of Historic Places The National Register of Historic Places (NRHP) is the United States federal government's official list of districts, sites, buildings, structures and objects deemed worthy of preservation for their historical significance or "great artistic v ...

in 1983.

References

Unincorporated communities in Baltimore County, Maryland Unincorporated communities in Maryland {{BaltimoreCountyMD-geo-stub