A list of Illinois state communities and their associated web pages.
- Macedonia
- Machesney Park
- Mackinaw
- Macomb
- Macon
- Madison
- Maeystown
- Magnolia
- Mahomet
- Maine Twp
- Makanda
- Malden
- Malta
- Manchester
- Manhattan
- Manito
- Manlius
- Mansfield
- Manteno
- Maple Park
- Mapleton
- Maquon
- Marengo
- Marietta
- Marine
- Marion
- Marissa
- Mark
- Markham
- Maroa
- Marseilles
- Marshall
- Martinsville
- Martinton
- Maryville
- Mascoutah
- Mason
- Mason City
- Matherville
- Matteson
- Mattoon
- Maunie
- Maywood
- Mazon
- McClure
- McConnell
- McCook
- McHenry
- McLean
- McLeansboro
- McNabb
- Mechanicsburg
- Medinah
- Medora
- Melrose Park
- Melvin
- Menard
- Mendon
- Mendota
- Meredosia
- Merna
- Metamora
- Metcalf
- Metropolis
- Michael
- Middletown
- Midlothian
- Milan
- Milford
- Mill Shoals
- Millbrook
- Millcreek
- Milledgeville
- Miller City
- Millington
- Millstadt
- Milmine
- Milton
- Mineral
- Minier
- Minonk
- Minooka
- Mitchell
- Modesto
- Mokena
- Moline
- Momence
- Monee
- Monmouth
- Monroe Center
- Montgomery
- Monticello
- Montrose
- Mooseheart
- Moro
- Morris
- Morrison
- Morrisonville
- Morton
- Morton Grove
- Mound City
- Mounds
- Mount Auburn
- Mount Carmel
- Mount Carroll
- Mount Erie
- Mount Morris
- Mount Olive
- Mount Prospect
- Mount Pulaski
- Mount Sterling
- Mount Vernon
- Mount Zion
- Moweaqua
- Mozier
- Muddy
- Mulberry Grove
- Mulkeytown
- Muncie
- Mundelein
- Murdock
- Murphysboro
- Murrayville
- Nachusa
- Naperville
- Naperville Twp
- Nashville
- Nason
- National City
- Nauvoo
- Nebo
- Nelson
- Neoga
- Neponset
- New Athens
- New Baden
- New Bedford
- New Berlin
- New Boston
- New Burnside
- New Canton
- New Douglas
- New Haven
- New Holland
- New Lenox
- New Memphis
- New Salem
- New Windsor
- Newark
- Newman
- Newton
- Niantic
- Niles
- Nilwood
- Niota
- Noble
- Nokomis
- Nora
- Normal
- Norridge
- Norris
- Norris City
- North Aurora
- North Barrington
- North Chicago
- North Henderson
- North Riverside
- Northbrook
- Northfield
- Northlake
- Oak Brook
- Oak Forest
- Oak Lawn
- Oak Park
- Oakbrook Terrace
- Oakdale
- Oakford
- Oakland
- Oakley
- Oakwood
- Oblong
- Oconee
- Odell
- Odin
- O’Fallon
- Ogden
- Oglesby
- Ohio
- Ohlman
- Okawville
- Old Mill Creek
- Olive Branch
- Olmsted
- Olney
- Olympia Fields
- Omaha
- Onarga
- Oneida
- Opdyke
- Opheim
- Oquawka
- Orangeville
- Oraville
- Oreana
- Oregon
- Orient
- Orion
- Orland Hills
- Orland Park
- Osco
- Oswego
- Ottawa
- Owaneco
- Ozark
- Palatine
- Palestine
- Palmer
- Palmyra
- Paloma
- Palos Heights
- Palos Hills
- Palos Park
- Pana
- Panama
- Papineau
- Paris
- Park Forest
- Park Ridge
- Parkersburg
- Patoka
- Patterson
- Paw Paw
- Pawnee
- Paxton
- Payson
- Pearl
- Pearl City
- Pecatonica
- Pekin
- Penfield
- Peoria
- Peoria Heights
- Peotone
- Percy
- Perks
- Perry
- Peru
- Pesotum
- Petersburg
- Philo
- Phoenix
- Piasa
- Pierron
- Pinckneyville
- Piper City
- Pittsburg
- Pittsfield
- Plainfield
- Plainview
- Plainville
- Plano
- Plato Center
- Pleasant Hill
- Pleasant
- Plains
- Plymouth
- Pocahontas
- Polo Pomona
- Pontiac
- Pontoon Beach
- Poplar Grove
- Port Byron
- Posen
- Potomac
- Prairie City
- Prairie du Rocher
- Preemption
- Princeton
- Princeville
- Prophetstown
- Prospect Heights
- Pulaski
- Putnam
- Radom
- Raleigh
- Ramsey
- Rankin
- Ransom
- Rantoul
- Rapids City
- Raymond
- Red Bud
- Reddick
- Redmon
- Renault
- Reynolds
- Richmond
- Richton Park
- Richview
- Ridge Farm
- Ridgway
- Ridott
- Rinard
- Ringwood
- Rio
- River Forest
- River Grove
- Riverdale
- Riverside
- Riverton
- Riverwoods
- Roanoke
- Robbins
- Roberts
- Robinson
- Rochelle
- Rochester
- Rock City
- Rock Island
- Rock Island Arsenal
- Rockbridge
- Rockfalls
- Rockford
- Rockport
- Rockton
- Rockwood
- Rolling Meadows
- Rome
- Romeoville
- Roodhouse
- Rosamond
- Roscoe
- Roselle
- Rosemont
- Roseville
- Rosiclare
- Rossville
- Round Lake
- Round Lake Beach
- Round Lake Heights
- Round Lake Park
- Roxana
- Royal
- Royalton
- Rushville
- Russell
- Rutland