Pennsylvania - Criteria: C (architecture/engineering)
| Carnegie Institute and Library |
| Carnell, Laura H., School |
| Carpenters' Hall |
| Carrick Furnace |
| Carrie Blast Furnace Number 6 and 7 |
| Carson College for Orphan Girls |
| Carson, Rachel, House |
| Carter-Worth House and Farm |
| Carversville Historic District |
| Cashier's House |
| Cassese, Joseph, House |
| Cassidy, Lewis C., School |
| Catasauqua Residential Historic District |
| Catawissa Friends Meetinghouse |
| Catharine, Joseph W., School |
| Cathedral of Learning |
| Cathedral of Saints Peter and Paul |
| Catlin Hall, Wilkes College |
| Cement City Historic District |
| Centennial Bridge |
| Centennial National Bank |
| Center Bridge Historic District |
| Centerville Historic District |
| Central Bethlehem Historic District |
| Central High School |
| Central Hotel |
| Central Norristown Historic District |
| Central Railroad of New Jersey Freight Station |
| Central Railroad of New Jersey Station |
| Central Railroad of New Jersey Station |
| Central Trust Company Buildings |
| Centre County Courthouse |
| Centre Mills |
| Century Building |
| Century Club of Scranton |
| Chadds Ford Historic District |
| Chain Bridge |
| Chalfont Historic District |
| Chamberlain-Pennell House |
| Chamberlin Iron Front Building |
| Chambersburg and Bedford Turnpike Road Company Toll House |
| Chambersburg Historic District |
| Chamounix |
| Chandler, George, School |
| Chandler Mill Bridge |
| Chanticleer |
| Charleroi Historic District |
| Charleroi-Monessen Bridge |
| Chateau Crillon Apartment House |
| Chatham Village Historic District |
| Cherry Springs Picnic Pavilion |
| Chester County Courthouse |
| Chester Creek Historic District |
| Chester Heights Camp Meeting Historic District |
| Chester Springs Historic District |
| Chester Waterside Station of the Philadelphia Electric Company |
| Chestnut Hill |
| Chestnut Hill Historic District |
| Chestnut Ridge and Schellsburg Union Church and Cemetery |
| Chestnut Street Log House |
| Cheyney, John, Log Tenant House and Farm |
| Cheyney, Squire, Farm |
| Chickies Historic District |
| Childs, George W., School |
| Christ Church |
| Christ Church Burial Ground |
| Christ Hamilton United Lutheran Church and Cemetery |
| Christman, Philip, House |
| Church Farm School Historic District |
| Church Hill Farm |
| Church of St. James the Less |
| Church of the Holy Trinity |
| Churchville Historic District |
| Cintra |
| Citizens National Bank of Latrobe |
| City Hall |
| City Line Avenue Bridge |
| City Park Brewery |
| Clarion County Courthouse and Jail |
| Clark, Sen. Joseph O., House |
| Clark, Silas M., House |
| Clarkson-Watson House |
| Class and Nachod Brewery |
| Clear Creek State Park Day Use District |
| Clear Creek State Park Family Cabin District |
| Clearfield Armory |
| Clearfield County Courthouse |
| Clear Spring Mill |
| Cliffs, The |
| Cline's Church of the United Brethren in Christ |
| Clinger-Moses Mill Complex |
| Clinton Street Historic District |
| Cliveden (Chew House) |
| Cloud Home |
| Clow, James Beach, House |
| Coalport Historic District |
| Coatesville Historic District |
| Coatesville Veterans Administration Hospital Historic District |
| Cobbs Creek Automobile Suburb Historic District |
| Cochran, Philip G., Memorial United Methodist Church |
Data from United States Park Service and Wikidata
