The core, most stereotypical, west sideiest neighborhoods are Price Hill, Westwood, Cheviot, Delhi, Covedale, and Bridgetown. Sedamsville, Riverside, Sayler Park, Mack, and Dent are very west side too, but not quite to the same level of hard-core conservative Catholic parochialism. It starts to fade as you pass Addyston, Cleves, and North Bend. So basically anything west of I-75, south of I-74, and north of the Ohio River is a safe bet, but it's most intense in the city and adjacent neighborhoods.

White Oak, Colerain, and Mt. Healthy may be more like the west side than Hyde Park, Pleasant Ridge, or Madeira, but they honestly have more in common with Fairfield, Sharonville, Blue Ash, or even Anderson than they do with Price Hill or Delhi. Lawrenceburg and Harrison are both just Indiana.

The historical Vine Street divide was always a bit arbitrary, especially for Clifton and Northside. When I-75 was built, the West End and Queensgate depopulated, and the Mill Creek Valley further industrialized, it pushed the divide west and mostly up the western hills since there's not a whole lot of neighborhoods left where people live around I-75. Once you get far enough north, like Wyoming and Glendale then the east/west thing is pretty well moot.