Pennsylvania - Area of significance: Engineering
| Cambridge Springs Bridge |
| Campbell's Bridge |
| Carrick Furnace |
| Centennial Bridge |
| Central Bethlehem Historic District |
| Chain Bridge |
| Chandler Mill Bridge |
| Charleroi-Monessen Bridge |
| City Line Avenue Bridge |
| Codorus Forge and Furnace Historic District |
| Cold Spring Bridge |
| Colemanville Covered Bridge |
| Colwell Cut Viaduct |
| Cope's Bridge |
| Coplay Cement Company Kilns |
| Coraopolis Bridge |
| Corbin Bridge |
| County Bridge No. 101 |
| County Bridge No. 124 |
| County Bridge No. 148 |
| County Bridge No. 171 |
| County Bridge No. 36 |
| County Bridge No. 54 |
| Creasyville Covered Bridge |
| Cuppett's Covered Bridge |
| Dauberville Bridge |
| Dauphin County Bridge No. 27 |
| Davis Covered Bridge |
| Davis Island Lock and Dam Site |
| Deer Creek Bridge, Stewartstown Railroad |
| Delaware Aqueduct |
| Delaware Division of the Pennsylvania Canal |
| Delaware Station of the Philadelphia Electric Company, The |
| Delta Trestle Bridge, Maryland and Pennsylvania Railroad |
| Diehls Covered Bridge |
| Dreibelbis Mill |
| Dreibelbis Station Bridge |
| Dunlap's Creek Bridge |
| Duquesne Incline |
| Dykeman's Spring |
| Eckman, Sam, Covered Bridge No. 92 |
| Ehrhart's Mill Historic District |
| Eliza Furnace |
| Ellicott, Andrew, House |
| English Center Suspension Bridge |
| Erb's Covered Bridge |
| Erie Armory |
| Erwinna Covered Bridge |
| Etters Bridge |
| Evansburg Historic District |
| Experimental and Safety Research Coal Mines |
| Experimental Mine, U.S. Bureau Of Mines |
| Fagleysville Road Bridge Crossing Swamp Creek |
| Farrandsville Iron Furnace |
| Feltons Mill Covered Bridge |
| Fischtner Covered Bridge |
| Forry's Mill Covered Bridge |
| Fortieth Street Bridge |
| Fort Mifflin |
| Fort Mifflin Hospital |
| Fowlersville Covered Bridge |
| Frankenfield Covered Bridge |
| Frankford Arsenal |
| Frankford Avenue Bridge |
| Frankford Avenue Bridge |
| Franklin Furnace Historic District |
| Frantz's Bridge |
| Frehn Bridge |
| Furnace Covered Bridge No. 11 |
| Geiger Covered Bridge |
| Geiger Mill |
| Gerloff Road Bridge Crossing Swamp Creek |
| Gibson's Covered Bridge |
| Gilbert Bridge |
| Girard Group |
| Glen Hope Covered Bridge |
| Glessner Bridge |
| Goodman Brothers and Hinlein Company |
| Gordon, Jervis, Grist Mill Historic District |
| Greisemer's Mill Bridge |
| Gross Bridge |
| Gudgeonville Covered Bridge |
| Guldin Mill |
| Hall's Bridge |
| Halls Mill Covered Bridge |
| Hammer Creek Bridge |
| Hare's Hill Road Bridge |
| Harlan House |
| Harmon's Covered Bridge |
| Harrington Covered Bridge |
| Harris Building |
| Harrisburg Central Railroad Station and Trainshed |
| Harrison Avenue Bridge |
| Hays Bridge Historic District |
| Heirline Covered Bridge |
| Herr's Mill Covered Bridge |
| Hewitt Covered Bridge |
| High Bridge |
| Hogback Bridge |
| Hollingshead Covered Bridge No. 40 |
Data from United States Park Service and Wikidata
