- Northwind Heating & Air Conditioning LLC
- Northworks Tavern LLC
- Nortown Auto LLC
- Norwegian-americian Hospital
- Noteworthy Brand
- Novachis Salon
- Novafix Solutions
- Novatzky Consulting LLC
- Nowhere Collective
- Nu Way Automatics
- Nude Dude Food, LLC
- Nuki Sushi Restaurant
- Nurturing Niche
- Nurturing Niche Nido
- O W Cellular Corp.
- Oak + Fort
- Oak Fabrics
- Oakley Fight Club & Fitness
- Oakley Interiors, INC
- Oasis Face Bar Wicker Park
- Oasis Spa
- Occult
- Octopus
- Odge's Restaurant
- Off Shore Spa
- Offbeat Thrift & Vintage
- Offset Bbq
- Ogden Automotive Center
- Ogden Automototive Center, INC.
- Ogden Avenue Materials INC
- Oggi Trattoria
- Oiistar
- Ok Consulating And Reading
- Ok Heating & Cooling INC
- Oki Doki Massage
- Oko Salon
- Ola Barra, Cocina & Lounge
- Ola's Liquors
- Old Lwiw Restaurant INC
- Old Town Barbershop Co.
- Oleg Grachev
- Oleg Heating & Cooling Corp.
- Olio
- Olio Wicker Park
- Olive Jewel Vintage & Antiquities
- Olivia's Market
- Omakase Shoji
- Ommi Foods
- On Shore INC.
- On Tour Brewing Company
- One Eleven Creative LLC
- One Strange Bird LLC
- One Stroke Nail Studio INC.
- One Tail At A Time
- One Tree Forest Films INC.
- One1eleven
- Onigiri Kororin
- Onion City Records
- Onni
- Onshore Networks Of Illinois, L.L.C.
- Ooh Catering & Events
- Opart Thai
- Open Books LTD.
- Orange Theory Fitness
- Orbit Imprints INC
- Orbit Medical Of Chicago, LLC
- Orchid911
- Order Express, INC.
- Organic Headshots
- Orlando Auto Top
- Oro Chocolate & Coffee
- Oscar Luis Martinez
- Osco Drug #3376
- Osteria Rusticana
- Ot Transition
- Oud Coffee And Cafe
- Ouslet Gallery
- Outfit Repeater
- Output
- Outset
- Oxygen Spa Studio
- Oxygene Shop
- Ozone Spa
- Ozzilly Neighborhood Dog Training
- P&m Studio LLC
- P3 Mediaworks, INC.
- P45 LLC
- Pablo's Rental Tiki Boat Chicago LLC
- Pack Contracting LLC
- Paleo Scavenger LLC
- Palm And Plume Interiors
- Palomino Service
- Panda Foot Spa
- Paniaguapo LLC
- Panoptic - Taris Development, LLC Series 6
- Panoptic Group INC.
- Pantry Pants
- Papa's Cache Sabroso INC
- Papanino's Pizza
- Paper Maps
- Paperish Mess
- Paradise Park
- Parallel Play Popup LLC
- Paramount Cleaners
- Parennial Golf
- Parinda USA INC.
- Paris312
- Parish Barbecue LLC
- Park Park
- Parker Miller
- Parking In Chicago
- Parlor Pizza Bar
- Partners Animal Hospital West Loop
- Passages Wine And Books
- Patricia M. Garcia
- Patrick Wallenberg
- Patron Gallery
- Paul Elledge Photography
- Paul Ries & Sons Ii
- Paul Wargaski Violins
- Paula & Monica's Pizzeria
- Paula Interiors LLC
- Paulie Gee's Wicker Park
- Paulo Gelato & Chocolate INC.
- Pe Erre La Casa Del Domino
- Peach Sky Photography, LLC
- Pearl Club
- Pearl Paint, Sip And Hip
- Pearle Vision
- Peck And Powell
- Peerless Development, LLC
- Pel Enterprises
- Penelope's
- Peony Beauty Studio
- Peoples Tax Service
- Pep Boys Auto Service & Tire
- Pep Club Vintage
- Pera's House Coffee & Dessert LLC
- Perfect Edge Handyman & Painting
- Perfektionz
- Performance Training Systems Chicago
- Performers Club West Town
- Perillo Collision Center
- Perno Photography
- Perpetual Books
- Perpetuum Designs
- Perry Casalino
- Pet Supplies Plus
- Petspets
- Ph Training, INC.
- Phil Circle Music Chicago
- Philip Nearing School Of Wing Chun
- Philz Coffee
- Phlebotomy Training Specialists
- Phoenix Vintage & General Store, LLC
- Phonology, LLC
- Phyllis' Musical Inn
- Phyzeke Dance Academy
- Picante Taqueria
- Piccoline Parenting And Childcare Education
- Piccolo Sogno
- Pickens-kane Moving & Stg
- Pie-eyed Pizzeria
- Pie, Pie My Darling
- Piece / Piece Out
- Pierogi Kitchen
- Pierre's Bakery
- Pilsen Heating & Cooling
- Pink Lady Candles
- Pink Monster Community Empowerment
- Pink Nail Spa
- Pinky Nail
- Pinky Nail
- Pinky Nail Chicago
- Pinky Nail Grand, INC.
- Pinnacle Valet LLC
- Pint
- Pipes And Stuff Xx
- Piranahs Fish & Chicken INC
- Pistil & Vine LLC
- Piva-beer Spa
- Pixie Salon
- Pizza Dada
- Pizza Friendly Pizza
- Pizza Friends LLC
- Pizza Hut
- Pizza Hut # 35190
- Pizza-metro
- Planet Access
- Plant Salon
- Platform Coworking
- Platform Coworking
- Platinum Smiles INC.
- Playa Bowls Bucktown
- Playcation LLC
- Plena Mercancia LLC
- Plenty Goods
- Plie Dancewear
- Plush Nail Salon
- Podhalanka Restaurant