| County Fire Districts | District 6 Fire Mutual Aid Association | 42.58741 | -71.35602 | 17 |
| County Fire Districts | District 14 Fire Mutual Aid Association | 42.33356 | -71.42266 | 16.7 |
| Municipalities | Acton | 42.48509 | -71.43284 | 4 |
| Municipalities | Arlington | 42.41537 | -71.15644 | 2 |
| Municipalities | Ashby | 42.67787 | -71.82035 | 4.5 |
| Municipalities | Ashland | 42.26121 | -71.4634 | 4 |
| Municipalities | Ayer | 42.5612 | -71.58979 | 3 |
| Municipalities | Bedford | 42.49065 | -71.27617 | 3 |
| Municipalities | Belmont | 42.39593 | -71.17867 | 2 |
| Municipalities | Billerica | 42.55843 | -71.26895 | 4 |
| Municipalities | Boxborough | 42.48343 | -71.51618 | 3 |
| Municipalities | Burlington | 42.50482 | -71.19561 | 3 |
| Municipalities | Cambridge | 42.3751 | -71.10561 | 3 |
| Municipalities | Carlisle | 42.52926 | -71.3495 | 3 |
| Municipalities | Chelmsford | 42.59981 | -71.36728 | 4 |
| Municipalities | Concord | 42.46037 | -71.34895 | 4 |
| Municipalities | Dracut | 42.67037 | -71.30201 | 3 |
| Municipalities | Dunstable | 42.67509 | -71.48284 | 4 |
| Municipalities | Everett | 42.40843 | -71.05366 | 2 |
| Municipalities | Framingham | 42.27926 | -71.41617 | 3 |
| Municipalities | Groton | 42.6112 | -71.57451 | 4 |
| Municipalities | Holliston | 42.2001 | -71.4245 | 4 |
| Municipalities | Hopkinton | 42.22871 | -71.52256 | 4 |
| Municipalities | Hudson | 42.39176 | -71.56618 | 4 |
| Municipalities | Lexington | 42.44732 | -71.2245 | 3 |
| Municipalities | Lincoln | 42.42593 | -71.30395 | 3 |
| Municipalities | Littleton | 42.53759 | -71.51201 | 4 |
| Municipalities | Lowell | 42.63342 | -71.31617 | 5 |
| Municipalities | Malden | 42.4251 | -71.06616 | 2 |
| Municipalities | Marlborough | 42.34593 | -71.55229 | 4 |
| Municipalities | Maynard | 42.43343 | -71.44951 | 3 |
| Municipalities | Medford | 42.41843 | -71.10616 | 3 |
| Municipalities | Melrose | 42.45843 | -71.06616 | 2.5 |
| Municipalities | Natick | 42.28343 | -71.3495 | 3 |
| Municipalities | Newton | 42.33704 | -71.20922 | 3 |
| Municipalities | North Reading | 42.57509 | -71.07867 | 3 |
| Municipalities | Pepperell | 42.66592 | -71.5884 | 4 |
| Municipalities | Reading | 42.52565 | -71.09533 | 3 |
| Municipalities | Sherborn | 42.23899 | -71.36978 | 3 |
| Municipalities | Shirley | 42.5437 | -71.64951 | 4 |
| Municipalities | Somerville | 42.3876 | -71.0995 | 2 |
| Municipalities | Stoneham | 42.4801 | -71.0995 | 2 |
| Municipalities | Stow | 42.43704 | -71.50562 | 3 |
| Municipalities | Sudbury | 42.38343 | -71.41617 | 3 |
| Municipalities | Tewksbury | 42.61065 | -71.23422 | 3 |
| Municipalities | Townsend | 42.66676 | -71.71618 | 5 |
| Municipalities | Tyngsborough | 42.66676 | -71.41617 | 4 |
| Municipalities | Wakefield | 42.50648 | -71.07283 | 2 |
| Municipalities | Waltham | 42.37649 | -71.23561 | 6 |
| Municipalities | Watertown | 42.37093 | -71.18283 | 6 |
| Municipalities | Wayland | 42.36676 | -71.36617 | 6 |
| Municipalities | Westford | 42.57926 | -71.43784 | 3 |
| Municipalities | Weston | 42.36676 | -71.30311 | 3 |
| Municipalities | Wilmington | 42.54648 | -71.17367 | 3 |
| Municipalities | Winchester | 42.4501 | -71.1495 | 3 |
| Municipalities | Woburn | 42.47926 | -71.15228 | 3.5 |
| Middlesex County Medical Agencies | C-MED | 42.518 | -71.45828 | 27 |
| Education | Bentley College | 42.38585 | -71.2206 | 15 |
| Education | Boston College | 42.331 | -71.16875 | 3 |
| Education | Brandeis University | 42.36649 | -71.25934 | 15 |
| Education | Framingham State University | 42.298 | -71.437 | 1 |
| Education | Harvard University | 42.37765 | -71.11885 | 2.7 |
| Education | Mass Bay Community College | 42.29194 | -71.41411 | 1 |
| Education | Massachusetts Institute of Technology | 42.3751 | -71.10561 | 15 |
| Education | Regis College | 42.35093 | -71.30916 | 1 |
| Education | Tufts University | 42.41843 | -71.10616 | 15 |
| Education | UMass - Lowell | 42.518 | -71.45828 | 27 |
| Hospitals | Cambridge Hospital | 42.518 | -71.45828 | 27 |
| Hospitals | Lowell General Hospital | 42.64754 | -71.34211 | 1 |
| Hospitals | MetroWest Medical Center | 42.2851 | -71.41885 | 1 |
| Hospitals | Mount Auburn Hospital | 42.37415 | -71.13422 | 1 |
| Hospitals | Newton Wellesley Hospital | 42.33114 | -71.24531 | 1 |
| Hospitals | Whidden Hospital (CHA) | 42.40912 | -71.03965 | 1 |
| Middlesex County Amateur Radio | Repeaters | 42.28343 | -71.3495 | 15 |
