I stumbled upon this little tidbit while reading a history of Essex, MA.
In 1873 English sparrows began to make their presence known here about this year--probably the progeny of those imported into Boston. It was believed that they would benefit agriculturists by destroying ravaging insects, but they did not fulfill expectations, and were soon declared worthless.
In 1889 "The English Sparrow (Passer domesticus) in North America" was published. According to their research the English Sparrow was brought to America via Brooklyn, NY. Eight pairs. They were released into the wilds in the Spring of 1851. Several trips to England were made for these birds and during the last delivery some escaped in Boston. Ten years later (1868) the English Sparrow was seen regularly in the Boston Commons.