| Londonderry Town - Occupational Data | FIPS Code=25050 |
| 1970 | |
| Employed Population | 419 |
| Professional - Technical - Kindred | 6 |
| Non-Farm Manager - Administrator | 64 |
| Sales Worker | 24 |
| Clerical Worker | 24 |
| Craftsperson - Foreperson | 85 |
| Non-Transport Operative | 51 |
| Transport Operative | 0 |
| Non-Farm Laborer | 41 |
| Farmer - Farm Manager | 3 |
| Farm Laborer | 11 |
| Non-Private Service | 49 |
| Household Service | 6 |
| Occupation Not Reported | 55 |
| 1980 | 1990 | |
| Employed Population | 709 | 714 |
| Executive - Administrator | 70 | 91 |
| Professional Speciality | 83 | 87 |
| Technicians - Related Support | 9 | 3 |
| Sales | 87 | 71 |
| Administrative - Clerical | 99 | 103 |
| Private Household Service | 4 | 9 |
| Protective Service | 6 | 7 |
| Non-Household, Non-Protective Service | 104 | 84 |
| Natural Resources | 25 | 33 |
| Precision Production - Craft | 109 | 135 |
| Machine Operators | 63 | 16 |
| Mover | 24 | 47 |
| Labor | 26 | 28 |
| 1980 | 1990 | ||
| Per Cent of Working Population Employed in Town of Residence | 45.37 | 36.00 | |
| 1970 | 1980 | 1990 | |
| Unemployment Rate | 4.54 | 8.87 | 10.75 |