Data through September 2026 · updated 20 Oct 2026
37 ZIP codes have 250 or more building permits in Baltimore County, October 2024 through September 2026. 21220 is the busiest with 5,329 (7% of 72,744). Together they hold 96% of the permits.
Busiest first, October 2024 through September 2026. Top kind of work is the one with the most permits in that ZIP code.
| ZIP code | Permits | Share | Top kind of work |
|---|---|---|---|
| 21220 | 5,329 | 7% | Electrical (1,988) |
| 21244 | 4,753 | 7% | Plumbing (1,477) |
| 21228 | 4,185 | 6% | Electrical (1,501) |
| 21093 | 4,082 | 6% | Electrical (1,478) |
| 21117 | 4,074 | 6% | Electrical (1,559) |
| 21208 | 3,690 | 5% | Electrical (1,279) |
| 21222 | 3,627 | 5% | Electrical (1,274) |
| 21234 | 3,583 | 5% | Plumbing (1,277) |
| 21136 | 2,898 | 4% | Electrical (1,131) |
| 21237 | 2,641 | 4% | Electrical (955) |
| 21227 | 2,592 | 4% | Electrical (857) |
| 21030 | 2,584 | 4% | Electrical (921) |
| 21236 | 2,528 | 3% | Electrical (914) |
| 21221 | 2,508 | 3% | Electrical (970) |
| 21207 | 2,223 | 3% | Electrical (910) |
| 21133 | 2,176 | 3% | Electrical (887) |
| 21204 | 1,905 | 3% | Electrical (746) |
| 21286 | 1,865 | 3% | Plumbing (699) |
| 21128 | 1,783 | 2% | Plumbing (581) |
| 21212 | 1,131 | 2% | Plumbing (443) |
| 21209 | 1,057 | 1% | Plumbing (404) |
| 21219 | 997 | 1% | Electrical (365) |
| 21152 | 954 | 1% | Plumbing (305) |
| 21131 | 914 | 1% | Electrical (330) |
| 21206 | 822 | 1% | Electrical (283) |
| 21162 | 807 | 1% | Electrical (227) |
| 21120 | 654 | under 1% | Electrical (244) |
| 21111 | 491 | under 1% | Electrical (167) |
| 21087 | 477 | under 1% | Electrical (169) |
| 21057 | 468 | under 1% | Electrical (176) |
| 21224 | 407 | under 1% | Electrical (156) |
| 21013 | 343 | under 1% | Plumbing (121) |
| 21229 | 340 | under 1% | Plumbing (121) |
| 21239 | 299 | under 1% | Electrical (118) |
| 21053 | 274 | under 1% | Electrical (86) |
| 21155 | 266 | under 1% | Electrical (93) |
| 21163 | 254 | under 1% | Electrical (102) |
19 more ZIP codes have fewer than 250 permits each (1,335 in all), so no page.
Source: Baltimore County GIS, Active Development map service: Cityworks Permits, Electrical Permits, Plumbing Permits and Gas Permits layers, read 20 Oct 2026. We count permits issued October 2024 through September 2026; denied and withdrawn permits are left out.
Building, electrical, plumbing and gas permits issued by Baltimore County Permits, Approvals and Inspections, which covers the whole county (it has no incorporated towns): Towson, Catonsville, Dundalk, Essex, Parkville, Pikesville, Owings Mills, Randallstown, Perry Hall, White Marsh and the rest. Baltimore City is a separate jurisdiction with its own permit office and is not in this file; the few trade permits whose ZIP code lies wholly inside Baltimore City are left out. Grading, storm-water and use-and-occupancy permits are not counted.
Counts are permits, not jobs: one job can need several permits. Nobody paid to be on this page and nobody can. Sources and definitions →
Free to reuse with attribution (CC BY 4.0). Please credit Contractor Records and link to this page. Suggested citation:
Contractor Records, "Building permits by ZIP code in Baltimore County", https://contractorrecords.com/baltimore-county/zip/, data through September 2026, from Baltimore County Permits, Approvals and Inspections building-permit records.Link to a table: ZIP codes by permits.
Download the tables (CSV): ZIP codes by permits.