Wikipedia:MILL

Something that is run-of-the-mill is a common, everyday, ordinary item that does not stand out from the rest. Something or someone that is "run-of-the-mill" is probably not notable. The phrase "run of the mill" appears to have originated from early factory quality control and described work that had not been graded and was therefore unlikely to be either exceptionally good or exceptionally bad.

A street map shows every street within a city, down to every cul-de-sac with just four houses. Every city has several detailed street maps that have been published. In one square mile of an urban area, there are hundreds, even thousands of streets and there can be hundreds of square miles within a city and its suburbs. It is not practical to create an article on every street as the high volume might overwhelm the capacity of editors to maintain them. Almost every city has police and fire departments. These departments can be so busy that they are mentioned almost daily in the local news but again, they are just ordinary police and fire departments doing their jobs.

Many people have one or more obituaries published detailing the fact that they died, information regarding their deaths and often information about their families and lives. This information is published in a newspaper, a reliable source. But in a single major city, there will be dozens of obituaries published each day.

For such a commonplace item to be worthy for inclusion in an article, there must be sources provided other than those that would source so many others just like it. This shows that there is also something unusual, something unique about that subject so that the article is not just blank is blank (which would essentially be a dictionary entry) and that it does not resemble hundreds of other articles by containing mostly the same words with a few fill-in-the-blanks. Once such notability has been established, the common sources (e.g. a map for a street) can then be used to verify the accuracy of information.

Some subjects in particular are extremely commonplace. This does not mean they are never notable. But it is surely not possible for all of them to be.

Nearly every house is listed in some directory identifying the company that built it and the people who live in it. This does not make it notable. There is a right to privacy when it comes to writing about a residence. Articles can be created on historic houses that a notable person has lived in or that are notable for another reason. Apartment complexes, housing developments and trailer parks, even though there may be websites about each one and even though they are often displayed on maps, are not notable on this basis.

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