List of highways numbered 3
The following highways are numbered 3, H-3, PRI-3, AH3, E03 and R3. For roads numbered A3, see A3 roads. For roads numbered M3, see M3. For roads numbered N3, see N3. For roads numbered 3A, see 3A.
International
Albania
- A3 motorway (Albania)
- SH-3 Road in Albania from Kapshtice to Tirana.
Argentina
Australia
New South Wales
Northern Territory
*Queensland
- M3/A3 (Brisbane)
- Burnett Highway
- State Route 3 – Isis Highway
South Australia
- Cross Road
Tasmania
Victoria
Western Australia
- State Route 3 – Reid Highway and Roe Highway
Austria
Belgium
Bolivia
Bulgaria
Burma
Cambodia
Canada
- Alberta Highway 3
- British Columbia Highway 3
- Manitoba Highway 3
- New Brunswick Route 3
- Newfoundland and Labrador Route 3
- Nova Scotia Trunk 3
- Ontario Highway 3
- Prince Edward Island Route 3
- Quebec Route 3
- Saskatchewan Highway 3
- Yellowknife Highway
- Yukon Highway 3
China
Costa Rica
Cuba
Czech Republic
- D3 motorway
- I/3 Highway
Djibouti
Dominican Republic
Eswatini
Finland
Germany
Greece
Hong Kong
Hungary
India
Indonesia
Iran
Iraq
Ireland
Israel
Italy
Japan
- *
- Route 3 (Shuto Expressway) in the Shibuya area of Tokyo
- Route 3 (Nagoya Expressway)
- Kobe Route
Kazakhstan
Korea, South
Laos
Malaysia
Mexico
Moldova
New Zealand
Nigeria
Oman
Paraguay
- [Image:R3-PY.svg|20px|] National Route 3
Philippines
Poland
Romania
Russia
Sri Lanka
- [A3 highway (Sri Lanka)|] Colombo-Puttalam Road
- Colombo–Katunayake Expressway
South Africa
Taiwan (Republic of China)
Thailand
Turkey
United Kingdom
- M3 motorway (Great Britain)
- A3 road (Great Britain)
- M3 motorway (Northern Ireland)
- A3 road (Northern Ireland)
United States
- Interstate 3
- Interstate A-3
- Interstate H-3
- Interstate PR-3
- U.S. Route 3
- New England Interstate Route 3
- Alabama State Route 3
- * County Route 3
- Alaska Route 3
- Arkansas Highway 3
- California State Route 3
- Colorado State Highway 3
- Connecticut Route 3
- Delaware Route 3
- Florida State Road 3
- * Florida State Road 3A (pre-1945)
- * County Road 3 (Brevard County, Florida)
- * County Road 3 (Volusia County, Florida)
- Georgia State Route 3
- * Georgia State Route 3N
- * Georgia State Route 3S (Thomaston)
- * Georgia State Route 3W (Albany 1946–1957)
- * Georgia State Route 3W (Albany 1960–1973)
- * Georgia State Route 3W (Thomaston)
- * Georgia State Route 3W (Atlanta–Marietta 1937–1946)
- * Georgia State Route 3W (Atlanta–Marietta 1954–1955)
- * Georgia State Route 3E (Thomaston)
- * Georgia State Route 3E (Atlanta–Marietta)
- Idaho State Highway 3
- Illinois Route 3
- Indiana State Road 3
- Iowa Highway 3
- K-3 (Kansas highway)
- Kentucky Route 3
- Louisiana Highway 3
- * Louisiana State Route 3
- Maine State Route 3
- Maryland Route 3
- Massachusetts Route 3
- M-3 (Michigan highway)
- Minnesota State Highway 3
- * County Road 3 (Anoka County, Minnesota)
- * County Road 3 (Chisago County, Minnesota)
- * County Road 3 (Goodhue County, Minnesota)
- * County Road 3 (Hennepin County, Minnesota)
- * County Road 3 (Ramsey County, Minnesota)
- * County Road 3 (St. Louis County, Minnesota)
- Mississippi Highway 3
- Missouri Route 3
- * Missouri Route 3 (1922)
- Montana Highway 3
- Nebraska Highway 3
- Nevada State Route 3
- New Jersey Route 3
- * County Route 3 (Monmouth County, New Jersey)
- ** County Route 3A (Monmouth County, New Jersey)
- * County Route 3 (Ocean County, New Jersey)
- New York State Route 3
- * New York [State Route 3A (1930–1932)]
- * New York State Route 3A (1932–1935)
- * New York State Route 3B (1930–1932)
- * New York State Route 3B (1932–1935)
- * New York [State Route 3C (1930–1932)]
- * New York State Route 3C (1932–1935)
- * New York State Route 3D (1931–1932)
- * New York State Route 3D (1932–1935)
- * New York State Route 3E (1930–1932)
- * New York State Route 3E (1932–1935)
- * New York State Route 3F (1931–1932)
- * New York State Route 3F (1932–1935)
- * New York State Route 3G
- * County Route 3 (Allegany County, New York)
- * County Route 3 (Cattaraugus County, New York)
- * County Route 3 (Chemung County, New York)
- * County Route 3 (Dutchess County, New York)
- * County Route 3 (Genesee County, New York)
- * County Route 3 (Greene County, New York)
- * County Route 3 (Jefferson County, New York)
- * County Route 3 (Livingston County, New York)
- * County Route 3 (Montgomery County, New York)
- * County Route 3 (Niagara County, New York)
- * County Route 3 (Oneida County, New York)
- * County Route 3 (Ontario County, New York)
- * County Route 3 (Oswego County, New York)
- * County Route 3 (Otsego County, New York)
- * County Route 3 (Rensselaer County, New York)
- * County Route 3 (Schoharie County, New York)
- * County Route 3 (Schuyler County, New York)
- * County Route 3 (St. Lawrence County, New York)
- * County Route 3 (Steuben County, New York)
- * County Route 3 (Suffolk County, New York)
- * County Route 3 (Westchester County, New York)
- North Carolina Highway 3
- North Dakota Highway 3
- Ohio State Route 3
- Oklahoma State Highway 3
- * Oklahoma State Highway 3E
- * Oklahoma State Highway 3W
- Oregon Route 3
- Pennsylvania Route 3
- Rhode Island Route 3
- South Carolina Highway 3
- Tennessee State Route 3
- Texas State Highway 3
- * Texas State Highway Loop 3
- * Texas State Highway Spur 3
- * Texas Farm to Market Road 3
- * Texas Park Road 3
- Utah State Route 3
- Vermont Route 3
- Virginia State Route 3
- Washington State Route 3
- * Primary State Highway 3 (Washington)
- West Virginia Route 3