4 Plus is a subtheme of the City theme. While 4 Plus is alos a standalone theme, this subtheme focuses on a couple sets that are City specific. These sets featured larger pieces and minifigures than standard themes and the same as other 4 Plus sets.
2 sets

60220 Garbage Truck

Theme / Subtheme City / 4 Plus
Year 2019
Pieces / Minifigs 90 / 2
Availability Retired
60220 LEGO City 4 Plus Garbage Truck
Retail $19.99
Value $24.78
Growth  +24.0%
Annual growth 3.7%

60212 Barbecue Burn Out

Theme / Subtheme City / 4 Plus
Year 2019
Pieces / Minifigs 64 / 2
Availability Retired
60212 LEGO City 4 Plus Barbecue Burn Out
Retail $9.99
Value $14.32
Growth  +43.3%
Annual growth 5.2%