At what east-to-west streets does Wrigleyville start and stop? -

I would say it starts at Addison and maybe ends on Grace???

According to the first site below it is between Irving Park and Diversey- though it is lumping Wrigleyville with Lakeview. The second site I found tends to agree with your boundary though.The City of Chicago site lumps it into Lakeview and does not recognize it as a separate official city neighborhood. Though to all of us it is probably the most famous neighborhood in the city.Hope these sources help!