Illinois State Route 251 runs north-south in Eastern Ogle County. This is Eastern Ogle Counties main surface highway. IL St Rt 251 passes through the following highways in Ogle County. Rochelle
A BGS on WB I-88/IL St Rt 110. A set of BGS's on WB I-88/IL St Rt 110. A BGS on WB I-88/IL St Rt 110. A BGS on WB I-88/IL St Rt 110. SB IL St Rt 251 near I-88 in Rochelle. NB IL St Rt 251 in Rochelle. A Ogle County mile marker. NB guide marker in Northern Ogle County. A Ogle County mile marker at the Ogle/Winnebago County Line.