
Monomoscoy Island
- County:
- Barnstable County
- County Seat:
- No
- Area (mi²):
- 0.232
- State:
- Massachusetts
Monomoscoy Island is a CDP located in Barnstable County, Massachusetts. Monomoscoy Island has a 2025 population of 117. Monomoscoy Island is currently declining at a rate of -1.68% annually but its population has increased by 2.63% since the most recent census, which recorded a population of 114 in 2020.
The average household income in Monomoscoy Island is $225,853 with a poverty rate of 0%. The median age in Monomoscoy Island is 45.2 years: 45.4 years for males, and 44.8 years for females.