| Emergency | 911 | |
| Fire | 847-658-8233 | |
| Police | 847-658-4531 | |
| Village Hall | 847-658-2700 | |
| Township: | ||
| Algonquin | 847-639-2329 | |
| Dundee | 847-428-2634 | |
| County: | ||
| McHenry | 815-334-4242 | |
| Post Office | 847-6587912 | |
| Park District | 847-428-7131 847-658-2700 |
|
| Library | 847-658-4343 | |
| Train | 312-322-6777 | |
| Gas | 888-642-6748 | |
| Electric | 800-334-7661 | |
| Water | 847-854-3440 | |
| Refuse | 800-447-1066 | |
| Telephone | 800-244-4444 | |
| Cable TV | 866-594-1234 | |
| School District: | ||
| 158 | 847-669-5248 | |
| 300 | 847-426-1300 | |
www.algonquin.org