The following State Routes run through Allegheny County, Pennsylvania:

Traffic Routes : One of the longest Pennsylvania state routes, this highway's southern terminus is located in Wilkinsburg, at an interchange with Interstate 376. The road then forms that borough's main street as Ardmore Boulevard, before entering Pittsburgh city limits. As the busy Penn Avenue and Washington Boulevard, the highway is a backbone of the northeastern section of the city, serving some of Pittsburgh's richest and poorest neighborhoods. After crossing the Allegheny River via the Senator Robert D. Fleming Bridge, the highway continues as the main drag through a variety of suburban communities. It is four lanes throughout and is frequently lines with businesses all the way to the Butler County line. : An essential north-south artery, this highway enters Allegheny County from a busy and quickly growing Washington County suburban corridor. The route is generally only four lane and is often congested from well beyond the county line, as it functions as Washington Road through a variety of prestigious suburbs. After entering the City of Pittsburgh, the route is briefly co-signed with I-376, before branching off of the expressway system to cross the Ohio River via the West End Bridge. Another short freeway stretch appears immediately after crossing the river, as the highway joins with Route 65, before becoming independent once again and winding as the often two-lane Marshall Avenue and Perrysville Avenue through a variety of ethnically diverse Pittsburgh neighborhoods. The route alternates between two and four lanes as it serves dense northern suburbs such as West View, before becoming four lanes for the rest of its time in the county after rejoining with its Truck US 19 branch. The highway eventually meets with the Pennsylvania Turnpike in Marshall Township and serves a heavily commercialized corridor, as it leaves Allegheny for Butler County and an increasingly vast extended suburban area. : This highway marks the original routing of US 19. In the 1940s, two sections of a truck bypass were built to keep heavy vehicles away from the narrow city streets on Pittsburgh's North Side. After the completion of area freeways, the truck designation became irrelevant and the two separate designations were combined. The southern terminus of the route is in the wealthy suburb of Mt. Lebanon. The highway then extends as the narrow and crowded four-lane Liberty Avenue through the dense suburb of Dormont and through Pittsburgh's south-central neighborhoods. The highway then turns to become briefly cosigned with Route 51, before hooking up with Interstates 376 and 279 to cross the Monongahela and Allegheny Rivers via the Fort Pitt Bridge and Fort Duquesne Bridge respectively. At the northern edge of city limits, the highway regains its independence, becoming the wide, four-lane, and business-lined McKnight Road for the rest of its journey. In McCandless, it rejoins its parent and meets its end. : This major cross-country highway serves as a freeway for almost its entire path through Allegheny County. It enters the region from Washington County in the west, serving as an expressway connection with Weirton, West Virginia. For its first two miles in the county, it functions independently, before US 30 joins its routing on what is known as the Parkway West. In the busy suburb of Robinson Township, US 22/30 joins on with Interstate 376, and it is cosigned in this manner through the city of Pittsburgh and until that route's eastern terminus. On the office park-lined streets of Monroeville, US 22 branches westward, serving as a four-lane connector as it heads toward suburbanized regions in Westmoreland County.

: At a confusing freeway junction in the East Allegheny neighborhood of Pittsburgh, this highway marks its western terminus. The highway begins as a narrow four-lane East Ohio Street, running in this function through the suburbs of Reserve Township and Millvale. Then, the highway transitions into the Allegheny Valley Expressway and serves as the main freeway connector for Pittsburgh's northeastern suburbs. In Harmar Township, the route intersects with the Pennsylvania Turnpike. As the route leaves Allegheny for Butler County, Pittsburgh's suburban regions transition toward rural hills, and the freeway connection continues to Kittanning. : The famous Lincoln Highway enters Allegheny County from a sparsely portion of southern Beaver County. The first mile encompasses one of the few rural patches of Allegheny County, before the two-lane route becomes much more suburban. Soon, the highway becomes cosigned with US 22 in Findlay Township and then with Interstate 376 as it functions as a portion of the Parkway West. Along with its two associated routes, the highway travels onward through Downtown Pittsburgh and into the city's eastern suburbs as the Parkway East. In Forest Hills, the road becomes independent once again and transitions into a busy four-lane, business-lined highway. As it reaches the Westmoreland County line, suburbia continues to line the major highway all the way to Greensburg. : A portion of the long planned Mon-Fayette Expressway, this toll highway remains incomplete in its goal to eventually connect Morgantown, West Virginia with Pittsburgh via the Monongahela Valley. The route enters the county from a small suburban corner of riverfront Washington County, then passes on a variety of viaducts on the rolling topography above the development of Jefferson Hills. The highway currently ends at a toll plaza and junction with Route 51. Future plans call for the route to be extended to I-376 in the eastern neighborhoods of Pittsburgh, although no timetable has been set for this expansion.

(SR 3160)

(locally maintained)

(SR 400)

Quadrant Routes State RouteNameFromToNotesState Route 1001Butler Street, Bridge Street, Main Street, Freeport Road, Pittsburgh Street, Freeport Road, Seventh Avenue, Tenth Avenue, Freeport RoadPA Route 28 in EtnaButler CountyFormer PA Route 28State Route 1002Unnamed PA Route 28 Off-rampPA Route 28 in O'Hara TownshipSR 1001 in O'Hara TownshipConnection between new and old PA Route 28 (Freeport Road)State Route 1003North Canal Street, Kittanning Pike, Dorseyville Road, Kittanning StreetSR 1001 in SharpsburgSR 4109 in EtnaState Route 1004Seifried Lane, Kirkwood DriveSR 1007 in O'Hara TownshipSR 1003 in O'Hara TownshipState Route 1005Highland Park BridgePA Route 28 in SharpsburgPA Route 8 in PittsburghState Route 1006Burchfield RoadPA Route 8 (Butler St., William Flinn Hwy) in Shaler TwpMiddle Road In Indiana TwpKlein Road, Harts Run Road, Dorseyville Road, Fox Chapel Road, Guys Run Road, Locust Hill RoadBridge over Little Pine Creek, Indiana TwpPA Route 910 (Indianola Road), Harmar TwpState Route 1007Sharps Hill RoadSR 1004 (Seifried Lane) on O'Hara Township/Shaler lineSR 1003 (Kittanning Pike) on O'Hara/Shaler lineState Route 1008Gulf Lab Road, U-PARCPA Route 910 (Indianola Road) in Harmar TwpSR 1015 (Russellton Road), Harmar TwpState Route 1009Powers Run RdFox Chapel Rd, Fox ChapelSR 1001 (Freeport Rd) in O'Hara TownshipState Route 1010Harts Run RdPA Route 8 (Butler St., William Flinn Hwy) in Hampton TwpSR 1013 (Saxonburg Road), Indiana TwpState Route 1011Guys Run RoadSR 1006 (Locust Hill Rd) in Harmar TwpSR 1001 (Freeport Rd), Harmar TwpState Route 1012McCully Road, Cedar Run Road, Church LanePA Route 8 (Butler St., William Flinn Hwy) in Hampton TwpSR 1013 (Saxonburg Road), Indiana TwpState Route 1013Saxonburg BoulevardPA Route 8 (Butler St., William Flinn Hwy) in Shaler TwpButler County lineState Route 1014Hite Road, Jacoby Road, Tawney Run Road, Murray Hill RoadSR 1015 (Russellton Road), Harmar TwpSR 1021 (Riddle Run Road), Springdale TwpState Route 1015Pearl Avenue, Little Deer Creek Road, Russellton RoadSR 1001 in Harmar TwpSR 1028 (Bakerstown Road), West Deer TwpState Route 1016State Route 1017Pillow Avenue, Yutes Run RoadSR 1001 in CheswickBorder of Springdale Twp and Frazer TwpState Route 1018State Route 1019Butler Street, Butler Road, Henderson Drive, Butler Logan Road, Russellton Airport Road, Creighton Russellton Road, Kurn RoadIntersection at Willow Street in SpringdaleBorder of West Deer Twp and Frazer TwpDays Run RoadBorder of Frazer Twp and East Deer TwpBaileys Run Road in East Deer TwpState Route 1020State Route 1021State Route 1022State Route 1023State Route 1024State Route 1025State Route 1026State Route 1027State Route 1028State Route 1029State Route 1030State Route 1031State Route 1032State Route 1033State Route 1034State Route 1035State Route 1036State Route 1037State Route 1038State Route 1039State Route 1040State Route 1045 State RouteNameFromToNotesState Route 2001State Route 2003State Route 2004State Route 2005State Route 2006State Route 2007State Route 2008State Route 2009State Route 2010State Route 2011State Route 2013State Route 2014State Route 2015State Route 2017State Route 2018State Route 2020State Route 2021State Route 2022State Route 2023State Route 2024State Route 2025State Route 2026State Route 2027State Route 2028State Route 2030State Route 2031State Route 2032State Route 2033State Route 2034State Route 2035State Route 2036State Route 2037State Route 2038State Route 2039State Route 2040State Route 2041State Route 2042State Route 2043State Route 2044State Route 2045State Route 2046State Route 2047State Route 2048State Route 2049State Route 2050State Route 2051State Route 2052State Route 2053State Route 2054State Route 2056State Route 2057State Route 2058State Route 2059State Route 2060State Route 2061State Route 2063State Route 2064State Route 2065State Route 2066State Route 2067State Route 2068State Route 2069State Route 2070State Route 2071State Route 2072State Route 2073State Route 2074State Route 2075State Route 2076State Route 2078State Route 2079State Route 2080State Route 2081State Route 2082State Route 2083State Route 2084State Route 2085Birmingham BridgePA Route 8375th AvenueState Route 2086State Route 2087State Route 2088State Route 2090State Route 2091State Route 2093State Route 2094State Route 2095State Route 2096State Route 2097State Route 2098State Route 2099State Route 2101State Route 2102State Route 2103Bigelow Boulevardbridge over Seventh Avenue (PA Route 380 east)State Route 2104State Route 2105State Route 2106State Route 2107State Route 2108State Route 2110State Route 2112State Route 2114State Route 2116State Route 2118State Route 2120State Route 2122State Route 2124State Route 2126State Route 2128Tenth Street BypassInterstate 279; U.S. Route 19 TruckEtna StreetState Route 2143State Route 2144Centre Avenuebridge over Interstate 579State Route 2146Webster Avenuebridge over Interstate 579State Route 2152State Route 2183State Route 2208Boulevard of the AlliesInterstate 279; U.S. Route 19 TruckPA Route 885State Route 2248State Route 2308