Zodiackillersite.com

Fascinating info and work guys. Well done and thanks for sharing.

Chaucer wrote:
So far, based on rather incomplete info, it appears as if the letters were mailed in the northeastern section of San Francisco with two hotspots being along Route 1 (19th Ave) and one other along Route 101.

Stine's school, San Francisco State, is located on the west side of 19th Avenue. I've always had a suspicion that Stine knew Zodiac.

I tried the best I can. Please feel free to amend

Thanks, Cragle! This great!

I can't speak for the others, but the 1A and 1B would be Central and Inner Richmond respectively.

4 would refer to Twin Peaks West area that includes Balboa Terrance and City College which we already have evidence of.

I believe the others: 85, 89, 940, 913, etc. refer to processing centers rather than neighborhoods which, if accurate, would make nailing down the location of the letter drop far more difficult.

Interesting that not a single (That we know of) was from around the immediate Vallejo area.

Even before the Stine attack he was posting from the SF Richmond area, so one must assume that he would've had to have a reason to be there. Especially when you consider that the first letters were postmarked on a weekday (Thursday PM) from the central Richmond area.

[quote="Cragle"]

Even before the Stine attack he was posting from the SF Richmond area, /quote]
My best guess - and it's merely and educated guess - is that if he lived in Vallejo, he took the 37 to the 101 across the Golden Gate and straight into north SF. From there he could continue down the 101 towards the Van Ness-Union mailing site, the Stine pickup site, the SF Chronicle/Examiner, etc. or take he exit to Route 1 straight into the Presidio, Richmond, and points south.

It appears that it was traveling convenience if nothing else.

ETA - I'd like to see the letters compared geographically and then chronologically. Perhaps his dropoffs changed over time.

If 15 authenticated letters were mailed from San Francisco -- including some that were clearly mailed on weekdays -- that would make a case for the Zodiac (or the letter writer) to be living in San Francisco.

Yes, obviously he could have gone to the trouble of driving from Vallejo to SF each time -- but the weekday mailings would narrow it down to someone who didn't work, or worked odd hours.

(Also someone driving to San Francisco from Vallejo would typically take Highway 80 and the Bay Bridge, as opposed to 37 and the Golden Gate Bridge.)

Xcaliber wrote:(Also someone driving to San Francisco from Vallejo would typically take Highway 80 and the Bay Bridge, as opposed to 37 and the Golden Gate Bridge.)

The letters could also provide a clue that he was from that side of the rather than Vallejo. As Chaucer has previously said a large number of the mailing are around 101 from San Rafael to SF and down to San Mateo.

Xcaliber wrote:If 15 authenticated letters were mailed from San Francisco -- including some that were clearly mailed on weekdays -- that would make a case for the Zodiac (or the letter writer) to be living in San Francisco.

Yes, obviously he could have gone to the trouble of driving from Vallejo to SF each time -- but the weekday mailings would narrow it down to someone who didn't work, or worked odd hours.

Well, based on the PM postmarks, he could have dropped them off in the morning on the way to work.

(Also someone driving to San Francisco from Vallejo would typically take Highway 80 and the Bay Bridge, as opposed to 37 and the Golden Gate Bridge.)

Was that true in the 1960's or 70's as well? I'm not being argumentative - I really don't know. It seems from Google and Apple maps that both routes are pretty equi-distant.

Yes, it would have been true back then as well, that a Vallejo local driving to San Francisco would typically take Interstate-80 the whole way. That was a simple straight shot at high speed. And SF was a bit easier to navigate back then via 80 as well -- the 1989 earthquake screwed up some of the access points.

Also 37 back then was a difficult two-lane road with no center divider. If someone was in no rush, they certainly might have taken 37 to 101, but it wouldn't have been as convenient as Interstate-80 the whole way.

Re the weekday PM postmarks -- yes he could have dropped them on the way to work, but that would have been inconvenient unless he lived in San Francisco.

Were the San Rafael and San Mateo letters authenticated?