They are available nationally, regionally, or locally. Newspaper allow you to reach possible nonreaders who might be part of your secondary target audience. Newspaper ads are easier to produce, and thus less costly. A TV ad, for example, may require special effects, actors, video footage, etc. Newspaper are good for repeat exposure, a vital element of effective advretising.
Newspaper can reach people who othrewise have little access to other media.
Many people buy newspaper not for the news, but to find out what's on sale today, or what's happening today. Movie ads are a prime example. They have better local market penetration than magazines. You can use dealer listings. They are flat, and more than literally.