Good links.
Check out repeaterbook.com, you may find many more repeaters that you're not monitoring.
Just a quick search of Cumberland county found quite a few hits. Most have been confirmed as on-air at sometime, so you may get lucky.
29.6800 -0.1 MHz 173.8 Windham Hill Cumberland N1FCU OPEN
145.3400 -0.6 MHz DMR Falmouth, Blackstrap Hill Cumberland W1IMD OPEN
146.4450 0 MHz CSQ Gray Cumberland KA1SHU OPEN
146.7300 -0.6 MHz 100.0 / 100.0 Falmouth, Blackstrap Hill (PAWA) Cumberland W1KVI OPEN
146.7600 -0.6 MHz 100.0 / 100.0 Portland Cumberland KA1SHU OPEN
146.8350 -0.6 MHz 103.5 / 103.5 Naples Cumberland K1AAM OPEN
146.9400 -0.6 MHz Yarmouth Cumberland K1JW OPEN
146.9550 -0.6 MHz 103.5 / 103.5 Portland Cumberland KA1SHU OPEN
147.0450 +0.6 MHz 103.5 / 146.2 Gray, NWS Forecast Office Cumberland K1MV OPEN
147.0900 +0.6 MHz 100.0 / 100.0 Falmouth, Blackstrap Hill Cumberland W1QUI OPEN
147.1350 +0.6 MHz 103.5 / 103.5 Brunswick, Growston Hill Cumberland WZ1J OPEN
147.2700 +0.6 MHz 103.5 / 103.5 Westbrook, Rocky Hill Cumberland W1CKD OPEN
147.3300 +0.6 MHz 100.0 / 100.0 Brunswick, Woodward Cove Cumberland K0LDO OPEN
147.3600 +0.6 MHz 100.0 / 100.0 Portland, Mitchell Hill Cumberland K1SA OPEN
444.1000 +5 MHz 82.5 Scarborough Cumberland W1KVI OPEN
444.2500 +5 MHz 82.5 / 82.5 Westbrook Cumberland N1ULM CLOSED
444.4000 +5 MHz 103.5 Holden, Riders Bluff Cumberland N1ME OPEN
444.6000 +5 MHz 82.5 / 82.5 Westbrook Cumberland W1CKD OPEN
444.9500 +5 MHz 146.2 Windham Hill Cumberland N1FCU OPEN
448.8250 -5 MHz DMR Falmonth Cumberland OPEN
1284.0000 -12 MHz 88.5 Brunswick, Oak Hill Cumberland K1MNW OPEN