| Grand Isle - Property Tax Rates | FIPS Code=13010 |
| Year | Effective Tax Rate |
| 1970 | 1.50 |
| 1972 | 1.82 |
| 1974 | 1.57 |
| 1978 | 1.93 |
| Year | Effective Tax Rate | Municipal Tax Rate | School Tax Rate | |
| 1980 | 1.73 | 0.46 | 1.27 | |
| 1982 | 1.75 | 0.36 | 1.39 | |
| 1983 | 1.58 | Not Available | Not Available | |
| 1985 | 1.44 | Not Available | Not Available | |
| 1987 | 1.59 | Not Available | Not Available | |
| 1988 | 1.40 | 0.21 | 1.19 | |
| 1989 | 1.44 | 0.27 | 1.17 |
| Year | Effective Tax Rate | Municipal Tax Rate | School Tax Rate |
| 1990 | 1.28 | 0.26 | 1.02 |
| 1991 | 1.47 | 0.23 | 1.24 |
| 1993 | 1.56 | 0.21 | 1.35 |
| 1995 | 1.89 | 0.22 | 1.66 |
| 1997 | 1.91 | 0.27 | 1.64 |