Where in North America is area code 198?

There is no area code +1 198 in North America (USA, Canada, etc.).

Area codes beginning with +1 98X are:

• +1 980 = Charlotte, NC, USA (overlay on +1 704)
• +1 984 = Raleigh, NC, USA (overlay on +1 919)
• +1 985 = Hammond, LA, USA
• +1 989 = Saginaw, MI, USA

(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, and many other countries use different prefixes.)