Here are the Ward boundaries for 1870 for the city of Milwaukee:

First Ward - Includes all that part of the city lying east of the Milwaukee River and north of Division Street.

Second Ward - Includes all that part of the city lying west of the Milwaukee River and between Cedar and Vliet Streets.

Third Ward - Includes all that part of the city lying east of the Milwaukee River and south of Wisconsin Street.

Fourth Ward - Includes all that part of the city lying west of the Milwaukee River and between Cedar Street and the southern boundary line of Sections 29 and 30.

Fifth Ward - Includes all that part of the city lying south of the Fourth Ward and between the Milwaukee River and First Avenue.

Sixth Ward - Includes all that part of the city lying north of Vliet Street and between the Milwaukee River and Seventh Street.

Seventh Ward - Includes all that part of the city lying east of the Milwaukee River and between Wisconsin and Division streets.

Eighth Ward - Includes all that part of the city lying south of the Fourth Ward and west of Monroe Street.

Ninth Ward - Includes all that part of the city lying west of Seventh and north of Vliet Street.

Notes on street names that have been changed:

Cedar Street - now Kilbourn Avenue

Division Street - now Juneau Avenue

Monroe Street - is not defined in the directory; however,

Wisconsin Street - now Wisconsin Avenue

I do not know where the boundary line of Sections 29 and 30 lay.

Numbered STREETS were on the North Side and numbered AVENUES on the South Side.

South Side Named Streets - running east & west beginning at Milwaukee River:

Juneau (now Seebooth; note: the street now known as Juneau Avenue was called Division Street)

Polk (now Pittsburgh)

Oregon

Florida

Virginia

Park (now Bruce)

Pierce

Elizabeth (now National Avenue)

Walker

Mineral

Washington

Scott

Madison

Railroad (now Greenfield)

Orchard

Lapham

Mitchell

No streets were listed south of Mitchell

South Side Named Streets - running north & south

Barclay

Clinton (now 2nd St

Reed (now 3rd St)

Hanover (now 4th St)

Greenbush (now 5th St)

Grove (now 5th Pl)

First Avenue (now 6th St)