Cleary Squared, Dorchester, MA 02136?

Cleary Square, believe it or not, was actually part of Dorchester.

Hyde Park itself was carved out of parts of West Roxbury, Dorchester, Milton and Dedham. According to this map, the town of Hyde Park didn't exist until 1888, and in 1912, it was annexed to the City of Boston.

I have an idea on what parts of Hyde Park came from where...and it looks like the Neponset River was considered the border between Dorchester, Milton and Dedham

Readville: Dedham's contribution was likely from the current Boston/Dedham line at Sprague Street, West Milton Street, and River Street, and formed an island of sorts between Neponset Valley Parkway and River Street. Milton's contribution was from Paul's Bridge east to the present Wolcott Square, and then to the Dedham Line. Had these borders not been changed, Readville could have also been called West Milton.

Cleary Square: Dorchester contributed all of its land from Fairmount Avenue down to near Turtle Pond Parkway, near Kelly Field.

Hyde Park west of Cleary Square: Dorchester and West Roxbury ceded new land to Hyde Park as follows: Dorchester gave up land from around Metropolitan Avenue east of the railroad tracks, Huntington Avenue east of Clare Avenue, and West Street past River St and all the way past the George Wright Golf Course on West Street (where West St changes to Poplar St). West Roxbury contributed everything from Bald Knob Road (now Enneking Parkway) east to Cleary Square, up to and including Gordon Avenue, Georgetowne, and Turtle Pond Parkway west of River St.

Hyde Park east of Cleary Square: Milton gave up almost all of its Brush Hill section east of Fairmount Avenue and north of Beacon St to Hyde Park. Truman Highway, formerly called Water Street, straddles the Neponset for almost its entire length, and ends about 1/4 mile east of Paul's Bridge. Technically, it crosses the Milton line right before the T intersection at Neponset Valley Parkway.

It is also likely that Metropolitan Avenue, currently divided into three seperate sections, formed the basis at least three sections of Hyde Park. 1-440 Metropolitan Avenue is within Roslindale (a part of West Roxbury); 450-800 Metropolitan Avenue is in Hyde Park (formerly part of Dorchester), and after crossing the river, 801-1000 Metropolitan Avenue is in the former Milton section and is bisected by Beacon St. Hence, the name Metropolitan.