Pennsylvania - Significance region: Local
| Cassidy, Lewis C., School |
| Catasauqua Residential Historic District |
| Catawissa Friends Meetinghouse |
| Catharine, Joseph W., School |
| Center Bridge Historic District |
| Center City West Commercial Historic District |
| Centerville Historic District |
| Central High School |
| 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 Furnace Mansion House |
| Centre Mills |
| Century Building |
| Century Club of Scranton |
| Chad House |
| Chalfont Historic District |
| Chalybeate Springs Hotel |
| Chamberlain-Pennell House |
| Chamberlin Iron Front Building |
| Chambersburg Historic District |
| Chandler, George, School |
| Chandler Mill Bridge |
| Chanticleer |
| Chateau Crillon Apartment House |
| Chester Heights Camp Meeting Historic District |
| Chester Waterside Station of the Philadelphia Electric Company |
| Chestnut Hill |
| Chestnut Ridge and Schellsburg Union Church and Cemetery |
| Chestnut Street Log House |
| Cheyney, John, Log Tenant House and Farm |
| Cheyney, Squire, Farm |
| Childs, George W., School |
| Chimney Rocks |
| Christ Hamilton United Lutheran Church and Cemetery |
| Church Farm School Historic District |
| Church Hill Farm |
| Churchville Historic District |
| Cintra |
| Citizens National Bank of Latrobe |
| City Hall |
| City Park Brewery |
| Clark, Sen. Joseph O., House |
| Clarkâs Ferry Tavern |
| Clark, Silas M., House |
| Clarkson-Watson House |
| Class and Nachod Brewery |
| Clearfield County Courthouse |
| Clear Spring Mill |
| Cline's Church of the United Brethren in Christ |
| Clinger-Moses Mill Complex |
| Cloud Home |
| Clow, James Beach, House |
| Coalport Historic District |
| Coates, Moses, Jr., Farm |
| Coatesville Historic District |
| Cobbs Creek Automobile Suburb Historic District |
| Cochran, Philip G., Memorial United Methodist Church |
| Coffee Pot, The |
| Coffeetown Grist Mill |
| Cogan House Covered Bridge |
| Coldbrook Farm |
| Cold Point Historic District |
| Cold Spring Farm |
| Cold Spring Farm Springhouse |
| Colebrook Iron Master's House |
| Colebrook Manor |
| Colerain Forges Mansion |
| Colfax Elementary School |
| College Heights Historic District |
| College Hill Residential Historic District |
| Colley, Abel, Tavern |
| Colonial Theatre |
| Columbia Historic District |
| Columbia Wagon Works |
| Colver-Rogers Farmstead |
| Comly, Watson, School |
| Commercial Hotel |
| Commodore Historic District |
| Como Farm |
| Compass Inn |
| Concord Friends Meetinghouse |
| Concord School |
| Conestoga Cork Works Building |
| Conewago Chapel |
| Congregational Store |
| Connell Mansion |
| Connellsville Union Passenger Depot |
| Connelly, Clifford B., Trade School |
| Connely-Holeman House |
| Conn, John P., House |
| Conroy Junior High School |
| Consolidated Ice Company Factory No. 2 |
| Consumers Cigar Box Company |
| Continental Building |
| Continental Stove Works |
| Conwell, Russell H., School |
Data from United States Park Service and Wikidata
