| Groton - Property Tax Rates | FIPS Code=5020 |
| Year | Effective Tax Rate |
| 1970 | 2.76 |
| 1972 | 2.19 |
| 1974 | 1.73 |
| 1978 | 1.97 |
| Year | Effective Tax Rate | Municipal Tax Rate | School Tax Rate | |
| 1980 | 1.86 | 0.62 | 1.24 | |
| 1982 | 1.43 | 0.58 | 0.85 | |
| 1983 | 1.22 | Not Available | Not Available | |
| 1985 | 1.03 | Not Available | Not Available | |
| 1987 | 1.26 | Not Available | Not Available | |
| 1988 | 1.31 | 0.35 | 0.96 | |
| 1989 | 1.04 | 0.25 | 0.79 |
| Year | Effective Tax Rate | Municipal Tax Rate | School Tax Rate |
| 1990 | 1.18 | 0.29 | 0.89 |
| 1991 | 1.18 | 0.35 | 0.83 |
| 1993 | 0.93 | 0.3 | 0.63 |
| 1995 | 1.02 | 0.27 | 0.75 |
| 1997 | 1.76 | 0.42 | 1.34 |