Lack of house numbers and/or lack of contrasting background for house numbers is a HUGE problem locally. While GPS technology does exist, it costs valuable time and is a distraction from getting to a scene for drivers. Regardless of the towns requirements, please install house numbers where they can be easily seen. This includes mailboxes on the roadside and on your home. Numbers should be large and easily contrast their surroundings. (Reflective is better)
Look around as you drive, especially at night. Missing numbers is a much bigger problem than you may think.