George Elliot made a superb job in presenting a realistic scenario for the story of Silas Marner. In the first place, it presents us with a small town with a strong sense of community and self-identity. Such towns are often characterized by having community members who take very seriously their individual roles within that community and they ensure that they respect he roles of others as well.
If you notice, small towns in real life often feature very colorful and unique characters: There is the town gossip, the town fool, the town leader, the nurturer, and many more. You can see the same sociology in other close knit communities such as apartment complex communities, military communities, and even church groups.
Therefore, Raveloe was portrayed with the same benchmarks that identify any other town or community in a non-fictional scenario, and it is done quite effectively because each character is sincere, realistic, and goes through situations that can possibly happen to us.