- Oadby - 4 companies
- Oadby, Leicester - 1 company
- Oak Drive - 1 company
- Oak Ridge - 1 company
- Oakham - 28 companies
- Oakhanger - 1 company
- Oban - 5 companies
- Off Atkinson Street, - 1 company
- Okehampton - 18 companies
- Old Buckenham - 1 company
- Old Dalby - 1 company
- Old Street - 1 company
- Old Trafford - 2 companies
- Old Woking - 1 company
- Oldbury - 58 companies
- Oldham - 226 companies
- Oldmeldrum - 2 companies
- Ollerton - 1 company
- Olney - 15 companies
- Olton - 1 company
- Omagh - 11 companies
- Ongar - 20 companies
- Ontario - 6 companies
- Orkney - 1 company
- ormskirk - 41 companies
- Orpington - 76 companies
- Orston - 1 company
- Orton Southgate - 2 companies
- Osgathorpe - 1 company
- Osset - 1 company
- Ossett - 34 companies
- Ostrów Wielkopolski - 1 company
- Oststeinbek - 1 company
- Oswaldtwistle - 1 company
- Oswestry - 27 companies
- Otley - 14 companies
- Ottery St. Mary - 1 company
- Overath-Vilkerath - 1 company
- Overton - 1 company
- Oxford - 122 companies
- Oxfordshire - 50 companies
- Oxon - 27 companies
- Oxon. - 1 company
- Oxshott - 1 company
- Oxspring - 1 company
Towns 1 to 45 | Page 1 of 2
