Mcneely was elected as a Democrat to the Forty-first and Forty-second Congresses (March 4, 1869-March 3, 1873). He did not seek renomination in 1872. He served as delegate to the Democratic National Conventions in 1872, 1892, and 1896. He resumed the practice of law in Petersburg, Illinois. He served as master in chancery for Menard County from 1910 until his death in Petersburg, Illinois, July 23, 1921. He was interred in Rosehill Cemetery.