Harrisburg is the county seat for Dauphin County
Duncannon is in Dauphin County
Dauphin County (318) ►ADJACENT TO DAUPHIN COUNTY Cumberland County (428) ► Juniata County (20) ► Lancaster County (548) ► Lebanon County (111) ► Northumberland County (113) ► Perry County (156) ► Schuylkill County (136) ► York County (438) ►
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| On William Penn Highway (U.S. 22/322) at County Road 849, on the right when traveling south on William Penn Highway. |
| On South River Road (Route 147), on the right when traveling east. |
| On North High Street at Plum Street, on the left when traveling north on North High Street. |
| On Cumberland Street at Water Street, on the left when traveling east on Cumberland Street. |
| On North Market Street at Clark Street, on the left when traveling north on North Market Street. |
| On Broadway at High Street, on the right when traveling west on Broadway. |
| On Cumberland Street at High Street, on the right when traveling west on Cumberland Street. |
| On Cumberland Street at High Street, on the right when traveling west on Cumberland Street. |
| On High Street just south of Maple Street, on the right when traveling south. |
| On South Market Street south of Cumberland Street, on the left when traveling south. |
| On South Main Street at US 11/15 Northbound Access Ramp, on the right when traveling south on South Main Street. |
| On South Main Street at US 11/15 Northbound Access Ramp, on the left when traveling north on South Main Street. |
| On North High Street north of Cumberland Street, on the left when traveling north. |
| On North Market Street (County Road 274), on the right when traveling north. |
| On Cumberland Street at Water Street, on the left when traveling east on Cumberland Street. |
| On South Market Street north of U.S. 11/15, on the right when traveling north. |
| On Main Street south of Fisher Street, on the right when traveling south. |
| On U.S. 11/15, on the right when traveling north. |
| On South Main Street south of Fisher Street, on the left when traveling south. |
| On South Main Street at New Bloomfield Road (Pennsylvania Route 274), on the right when traveling south on South Main Street. |
| On William Penn Highway (U.S. 22/322) at U.S. 11/15, on the right when traveling south on William Penn Highway. |
| On U.S. 11/15, on the right when traveling north. |
