County Route 21, Cameron
- County Route 21 Pleasant Valley Dairy Family
- 4690 County Route 21 Stevenson, Richard
- 4690 County Route 21 Stevenson, Richard
- 4740 County Route 21 Boyds Corners Bible Church
- 4813 County Route 21 Lurcock, Ward
- 4820 County Route 21 Asendorf, Jeffery Thomas
- 4900 County Route 21 Welch, Austin
- 4900 County Route 21 Gill, Jeremy
- 4904 County Route 21 Dickerson, Deric E
- 5002 County Route 21 Wheaton, Lynn H
- 5003 County Route 21 Henry, Jennifer L
- 5062 County Route 21 Willke Estate, Joyce W