In case it’s of any help, here’s another clipping from the 1963 Examiner describing the ZIP system. 94104 is listed as "Rincon North."

If the numbers on the postmarks really do correspond to the last digit of the ZIP code, then "1" is perhaps the most interesting, as it would seem to indicate that the letters were mailed at the main post office, which I believe was at the corner of 7th and Mission back then (it was also the Court of Appeals for the 9th Circuit). Note that 94101 is no longer a valid ZIP code in SF — the main post office has moved.

By the way, which letters had "6" on their postmarks?

The above information is very useful. Thanks for finding and providing the information.

As a side note:

I wrote a post regarding the exorcist letter symbols. I don’t recall the title. I outlined what I thought each symbol represented. One of the symbols I outlined I thought pertained to the US 9th circuit Court of appeals and post office.

Tying the connections.

Soze

As a side note:

I wrote a post regarding the exorcist letter symbols. I don’t recall the title. I outlined what I thought each symbol represented. One of the symbols I outlined I thought pertained to the US 9th circuit Court of appeals and post office.

Tying the connections.

Soze

Very interesting! Thanks!

Here are some businesses in the "Rincon Caller" ZIP code (94106):

Pacific Gas & Electric
245 Market Street

Greyhound Amazing America Vacations
369 Market Street

Fairmont Hotel (!)
950 Mason Street

The Seventh Step Foundation (a transitional housing program)

Dean Witter & Co. (stock brokerage and securities firm)
45 Montgomery Street

Fireboard Corporation
475 Brannan Street

Maryland Casualty Company (insurance)
450 Sansome Street

Where are you guys getting these businesses? Are they from 69 or current?

I suppose the thought is that we might can determine a profession by studying the businesses in a given postal zone?

Not knocking just asking.

Soze

Where are you guys getting these businesses? Are they from 69 or current?

I suppose the thought is that we might can determine a profession by studying the businesses in a given postal zone?

Not knocking just asking.

Soze

Sorry, I forgot to say that I got them from searching newspapers from 1970. My idea behind looking for businesses in the 94106 ZIP code was that this ZIP code was associated with the "Rincon Caller Boxes." Basically, I am guessing that these businesses used something like a P.O. box at the Rincon Post Office, so if some of the Z letters had a "6," and if "6" means ZIP code 94106, then he may have been associated with one of those businesses. (Lots of "ifs," I know.) But more generally, if he was consistently mailing letters from this area, he likely had some connection to the area, and it might be worth exploring who the major employers around there were at the time.

Where are you guys getting these businesses? Are they from 69 or current?

I suppose the thought is that we might can determine a profession by studying the businesses in a given postal zone?

Not knocking just asking.

Soze

Sorry, I forgot to say that I got them from searching newspapers from 1970. My idea behind looking for businesses in the 94106 ZIP code was that this ZIP code was associated with the "Rincon Caller Boxes." Basically, I am guessing that these businesses used something like a P.O. box at the Rincon Post Office, so if some of the Z letters had a "6," and if "6" means ZIP code 94106, then he may have been associated with one of those businesses. (Lots of "ifs," I know.) But more generally, if he was consistently mailing letters from this area, he likely had some connection to the area, and it might be worth exploring who the major employers around there were at the time.

I would think that anyone could walk into any post office and mail a letter. Wouldn’t necessarily have to be an employee of a business. I still like the idea of exploring the possibility though. I also like the idea of perhaps comparing the businesses from one mailing jurisdiction to another mailing jurisdiction to see if perhaps there is something (business perhaps) that links them together aside from the post offices. Been thinking a lot about the PO this evening and the exorcist letter I mentioned earlier. There was one location, industrial/Oakdale, that all I could come up with was the bureau of reclamation. Well it’s in I think PO district 10 and there was a po like 2 blocks away. The same for the chronicle, Belli’s office, Union square, etc. Going from memory so don’t hold me to it. Just gets me feeling like he was a postal worker of some capacity. Maybe not a mailman or a clerk. Maybe a vehicle mechanic for PO or even one of those mechanics that worked on the PO machines. I don’t know. Just thinking out loud I guess. Anyway, I would like to help with this business thing. What could I do?

Soze

How sure are we that the ZIP codes correspond to old city districts?

If it is true, could we post a map and update it with the potential new mailing locations?

How sure are we that the ZIP codes correspond to old city districts?

I’m confident that we have the right postal zones. I don’t think we have a solid explanation for the a and b designation s though unless I’ve missed it.

Postal districts and city districts are not the same.

I would offer up a map of each but appear to have misplaced both. I will continue to look.

Soze

How sure are we that the ZIP codes correspond to old city districts?

I’m confident that we have the right postal zones. I don’t think we have a solid explanation for the a and b designation s though unless I’ve missed it.

Postal districts and city districts are not the same.

I would offer up a map of each but appear to have misplaced both. I will continue to look.

Soze

So, at this point, are we to completely disregard the neighborhood map we were using previously?

I personally think so, this seems more likely to be correct.

I questioned using a "realtor" map of today when we needed something of the time. Postal maps of the time make sense given we are talking about post marks and mailing locations. What throws me for a loop is the A/B. Looking at the residential we see the A/B. We don’t see it with the postal. So I think I need an explanation for a postal A/B. My biggest fear is that the A/B for postal is going to be nothing more than what’s thought to be the case for the 89.

Outside of the above I am all for going the postal route.

Soze

Just thinking out loud but there could be something that the 94104 / 94106, Vallejo, the Dec 20 attacks and possibly the July 4 have in common. The Pacific Gas and Electric company.

David Faradays father worked for them and I’m sure they would have had some sort of presence in the July 4th parade.

I’m sure it’s just a coincidence but an interesting one nonetheless.

The founders of pge, before they became pge, worked on a schooner that was known as the "Zodiac".

Soze

Just thinking out loud but there could be something that the 94104 / 94106, Vallejo, the Dec 20 attacks and possibly the July 4 have in common. The Pacific Gas and Electric company.

David Faradays father worked for them and I’m sure they would have had some sort of presence in the July 4th parade.

I’m sure it’s just a coincidence but an interesting one nonetheless.

It’s always been my suspicion that Zodiac had a connection to electrical work – specifically the electric company.

Cragle, can you explain what you mean by 94104/94106/Vallejo, and the Lake Herman attacks have in common with PG&E?

Just thinking out loud but there could be something that the 94104 / 94106, Vallejo, the Dec 20 attacks and possibly the July 4 have in common. The Pacific Gas and Electric company.

David Faradays father worked for them and I’m sure they would have had some sort of presence in the July 4th parade.

I’m sure it’s just a coincidence but an interesting one nonetheless.

It’s always been my suspicion that Zodiac had a connection to electrical work – specifically the electric company.

Cragle, can you explain what you mean by 94104/94106/Vallejo, and the Lake Herman attacks have in common with PG&E?

PG&E’s head office was situated at 245 Market St at the time, this was a couple of blocks from the 94104 area. Also they used a 94106 Zip code (Postbox).

They also has a large office building situated in Vallejo which David Faradays father worked for.

The July 4th parade in Vallejo, orgainsed by the Chamber of Commerce would i’m sure had some sort of PG&E presence.

Soze’s comment is also interesting "The founders of pge, before they became pge, worked on a schooner that was known as the "Zodiac"."