#10. Rockingham County

- Homes built 1939 or earlier: 13.2% (18,025 homes)
- Homes built since 2000: 1.0% (1,405 homes)
- Median year homes built: 1982
- National rank: #1,359
- Total homes built: 136,681

#9. Carroll County

- Homes built 1939 or earlier: 15.2% (6,116 homes)
- Homes built since 2000: 0.5% (186 homes)
- Median year homes built: 1981
- National rank: #1,213
- Total homes built: 40,110

#8. Belknap County

- Homes built 1939 or earlier: 16.6% (6,443 homes)
- Homes built since 2000: 0.7% (261 homes)
- Median year homes built: 1979
- National rank: #1,099
- Total homes built: 38,718

#7. Hillsborough County

- Homes built 1939 or earlier: 18.6% (32,821 homes)
- Homes built since 2000: 0.5% (883 homes)
- Median year homes built: 1977
- National rank: #968
- Total homes built: 176,753

#6. Strafford County

- Homes built 1939 or earlier: 20.1% (11,311 homes)
- Homes built since 2000: 1.1% (629 homes)
- Median year homes built: 1978
- National rank: #860
- Total homes built: 56,162

#5. Grafton County

- Homes built 1939 or earlier: 21.0% (10,787 homes)
- Homes built since 2000: 0.9% (468 homes)
- Median year homes built: 1980
- National rank: #817
- Total homes built: 51,478

#4. Sullivan County

- Homes built 1939 or earlier: 24.4% (5,342 homes)
- Homes built since 2000: 0.2% (54 homes)
- Median year homes built: 1974
- National rank: #640
- Total homes built: 21,905

#3. Merrimack County

- Homes built 1939 or earlier: 24.8% (16,380 homes)
- Homes built since 2000: 0.6% (364 homes)
- Median year homes built: 1977
- National rank: #618
- Total homes built: 66,080

#2. Cheshire County

- Homes built 1939 or earlier: 27.4% (9,788 homes)
- Homes built since 2000: 0.4% (141 homes)
- Median year homes built: 1972
- National rank: #477
- Total homes built: 35,777

#1. Coos County

- Homes built 1939 or earlier: 30.2% (6,227 homes)
- Homes built since 2000: 0.4% (82 homes)
- Median year homes built: 1969
- National rank: #339
- Total homes built: 20,589