Catarman comprises 14 barangays with an estimated population of 14,495. 6 of its barangays (43%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Alga | 494 | 0 | Dead zone: no towers from any source |
| Bonbon | 2,213 | 3 | Verified coverage (NTC + crowdsourced) |
| Bura | 727 | 1 | Crowdsourced signal only (no registered tower) |
| Catibac | 586 | 1 | Crowdsourced signal only (no registered tower) |
| Compol | 767 | 1 | Verified coverage (NTC + crowdsourced) |
| Lawigan | 635 | 2 | Registered tower only (not crowd-verified) |
| Liloan | 661 | 0 | Dead zone: no towers from any source |
| Looc | 1,269 | 0 | Dead zone: no towers from any source |
| Mainit | 1,845 | 0 | Dead zone: no towers from any source |
| Manduao | 656 | 0 | Dead zone: no towers from any source |
| Panghiawan | 670 | 1 | Crowdsourced signal only (no registered tower) |
| Poblacion | 1,800 | 2 | Verified coverage (NTC + crowdsourced) |
| Santo Niño | 963 | 0 | Dead zone: no towers from any source |
| Tangaro | 1,209 | 1 | Crowdsourced signal only (no registered tower) |