Born at Avoca, Wisconsin, on September 28, 1858 and came to a farm eight miles north of Dakota City with his parents when he was four years. He moved into Dakota City in 1864. Judge Coyle finished school in Dakota City when he was 12 years of age, and did not again attend until he was sixteen. He went to Humboldt College in the fall of 1874, and attended state university at Iowa City in 1876, finishing law school there in 1881. He returned to Dakota City to practice law, and remained there for five years. In 1882 he was elected mayor of Dakota City. He ran for the legislature in the fall of 1889 on the Republican ticket, was elected, and served one term, declining another nomination. He also practiced law in Fort Dodge. He was elected to the judgeship for this district in 1906, and held this office for 24 years resigning in 1930. Mr. Coyle was married to Salle Hamm on March 18, 1882 at Springdale, Iowa.