| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Lake Pocotopaug | city | Connecticut | United States | 41.60 | -72.51 | 830 | |
| Lake View | city | Connecticut | United States | 41.36 | -72.51 | 298 | |
| Lake View Terrace | city | Connecticut | United States | 41.95 | -72.37 | 830 | |
| Lakeridge Heights | city | Connecticut | United States | 41.52 | -72.64 | 95 | |
| Lakeside | city | Connecticut | United States | 41.68 | -73.24 | 898 | |
| Lakeside | city | Connecticut | United States | 41.43 | -73.23 | 200 | |
| Lakeside Woods | city | Connecticut | United States | 41.57 | -73.49 | 830 | |
| Lakeville | city | Connecticut | United States | 41.96 | -73.44 | 830 | |
| Lakewood | city | Connecticut | United States | 41.58 | -73.03 | 830 | |
| Lamson Corner | city | Connecticut | United States | 41.74 | -72.97 | 830 | |
| Lanesville | city | Connecticut | United States | 41.54 | -73.42 | 255 | |
| Lattins Landing | city | Connecticut | United States | 41.45 | -73.43 | 830 | |
| Laurel Beach | city | Connecticut | United States | 41.18 | -73.09 | 0 | |
| Laurel Glen | city | Connecticut | United States | 41.47 | -71.81 | 167 | |
| Laysville | city | Connecticut | United States | 41.35 | -72.30 | 91 | |
| Lebanon | city | Connecticut | United States | 41.64 | -72.21 | 396 | |
| Ledyard Center | city | Connecticut | United States | 41.44 | -72.01 | 298 | |
| Leesville | city | Connecticut | United States | 41.51 | -72.48 | 114 | |
| Leetes Island | city | Connecticut | United States | 41.27 | -72.71 | 39 | |
| Leffingwell (historical) | city | Connecticut | United States | 41.51 | -72.14 | 98 | |
| Liberia (historical) | city | Connecticut | United States | 41.31 | -72.91 | 13 | |
| Liberty Hill | city | Connecticut | United States | 41.67 | -72.25 | 830 | |
| Liberty Mobile Home Park | city | Connecticut | United States | 41.68 | -72.85 | 190 | |
| Lime Rock | city | Connecticut | United States | 41.93 | -73.39 | 830 | |
| Litchfield | city | Connecticut | United States | 41.75 | -73.19 | 1079 | |
| Little City | city | Connecticut | United States | 41.45 | -72.60 | 830 | |
| Little Danbury | city | Connecticut | United States | 41.13 | -73.24 | 0 | |
| Little Danbury (historical) | city | Connecticut | United States | 41.13 | -73.25 | 0 | |
| Little Haddam | city | Connecticut | United States | 41.48 | -72.45 | 360 | |
| Litçfeld | city | Connecticut | United States | 41.75 | -73.19 | 1079 | |
| Llundain Newydd | city | Connecticut | United States | 41.36 | -72.10 | 9 | |
| Lonetown | city | Connecticut | United States | 41.32 | -73.38 | 830 | |
| Long HIll Estates | city | Connecticut | United States | 41.54 | -72.68 | 196 | |
| Long Hill | city | Connecticut | United States | 41.35 | -72.05 | 68 | |
| Long Hill | city | Connecticut | United States | 41.57 | -73.02 | 830 | |
| Long Hill | city | Connecticut | United States | 41.27 | -73.22 | 416 | |
| Long Hill | city | Connecticut | United States | 41.53 | -72.66 | 154 | |
| Long Ridge | city | Connecticut | United States | 41.16 | -73.60 | 830 | |
| Lord Corner (historical) | city | Connecticut | United States | 41.36 | -72.55 | 305 | |
| Lords Point | city | Connecticut | United States | 41.34 | -71.93 | 0 | |
| Lordship | city | Connecticut | United States | 41.15 | -73.11 | 0 | |
| Lovely Street | city | Connecticut | United States | 41.78 | -72.89 | 246 | |
| Lower City | city | Connecticut | United States | 41.92 | -73.28 | 898 | |
| Lower Merryall | city | Connecticut | United States | 41.65 | -73.42 | 830 | |
| Lydallville | city | Connecticut | United States | 41.80 | -72.49 | 396 | |
| Lyme Station | city | Connecticut | United States | 41.30 | -72.33 | 49 | |
| Lyons Plain | city | Connecticut | United States | 41.23 | -73.35 | 141 |