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O'Brien Land Surveying provides professional Land Surveying services to Northern Eastern Illinois for over 25 years! We serve these Illinois counties: Lake, McHenry, Cook, DuPage, Will, Kane and many more. We offer Boundary Surveys, Mortgage Surveys, Topography, Construction Staking, Subdivisions, A.L.T.A. Surveys, FEMA Flood Certificates, Annexation Dedications, Farm Surveys, Updates & more. OBrien Land Surveying is professional, dependable, honest and reasonably priced.