I'm interested in finding the start position of each nucleotide in a given genome. I first went to EcoCyc and wrote a scraping script for their E coli data, but I can't find the same web page layout for other specimen. So wondering if there is a database with more consistent formatting and such things. I've been looking around BLAST (?), but got confused with the resources, and rather than spinning my wheels, thought I'd ask for some pointers where to start.
I would suggest using the FTP at NCBI to download GFF files for whatever organisms you are interested in, as suggested by commenters. GFF files will have annotations for the genome for genes and also for many other features (figure 1).
Not entirely clear about the goals of this, but if you want annotated coordinates of things in genomes GFFs are a good place to start.
Note that many/most genomes will not have assemblies at the chromosome level, but only at the scaffold/contig level. Depending on your application that may be an issue.
If you want to go to a specific genome/organism, you can search it here. You can access the FTP through the interface for each genome there.