Geographic coverage
Permits by county
All permits in the database, grouped by county.
Trade breakdown
Permits by trade
Counts across all permits ever filed. One permit can appear in multiple categories, so these totals will exceed the permit count above.
Geographic activity
Most active zip codes
Top 10 zip codes by total permit volume in Carroll County.
| # |
Zip code |
Permits |
| 1 |
21784 |
|
| 2 |
21157 |
|
| 3 |
21158 |
|
| 4 |
21771 |
|
| 5 |
21074 |
|
| 6 |
21048 |
|
| 7 |
21787 |
|
| 8 |
21102 |
|
| 9 |
21776 |
|
| 10 |
21104 |
|
Weekly trends
Permits by county, by week
52-week rolling view. Each bar is one week of filed permits across all permits with a date, including those without a resolved address.
Data freshness
Permit date range by county
Oldest and newest permit on record for each county.
| County |
Oldest permit |
Newest permit |
Span |
| Carroll County |
Jan 1, 2026 |
Jun 5, 2026 |
5 months
|
| Frederick County |
Mar 31, 2026 |
Jun 6, 2026 |
2 months
|
| Howard County |
Mar 1, 2026 |
Jun 6, 2026 |
3 months
|
See the full picture.
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