considering the larger population in SoCal, why are all the state offices–governor, senator, A/G, etc–all come from northern Cal?
Random chance?
I don’t know about California specifically, but it’s fairly common for the state capital to not be in the most populous city/region of the state (e.g. Albany, New York; Springfield, Illinois).
Why? Maybe they wanted a capital that was more centrally located. Maybe the state’s demographics have changed since the capital city was established. Maybe it’s for the sake of balance, so that one city or area don’t completely overwhelm the rest of the state.
The motivated people live in the north and the southern part of the state is about beaches and Hollywood? 
As far as the demographics, in 1900 LA was only 102,479 with San Diego only 17,700
San Francisco was 342,782 with Oakland 66960 & Sacramento 29,282
Why Sacramento Is The Capital Of California
*Sacramento was a logical choice for the Capital of California. First, because of the Gold Rush, Sacramento had become the destination point for the new settlers coming to California to strike it rich. With the gold miners came shopkeepers, blacksmiths, and other service related entrepreneurs that gave the City an economic base.
Second, Sacramento, unlike the other temporary Capitals was not near the ocean so there was little chance of invasion. However, Sacramento’s proximity to rivers that led to San Francisco and other ports allowed the City to engage in the economy both on land and at sea.
Last, many of the most powerful people in the newly formed State of California were in Sacramento. John Sutter and John Marshall helped found the City. The City had already been planned, street grids were completed, and it already had a government in place. In Sacramento no city had to be formed. Rather, the Capital could be moved into an area that had already been established*
More to the point, Los Angeles was a small hamlet when California became a state, and all the action was up north during the Gold Rush. I think I learned somewhere that during the Gold Rush, San Francisco burned down (before 1906) and there was a plague going on there at the time the state formed, and business interests (both legit and sketchy) did not want the gold flowing to SF, so when the city leaders of Sacramento offered free land for the Capital, it was a done deal.
I think the OP is asking why the current office holders are all from the northern end of the state. I agree with Musicat; totally random. As for the location of the capital, back when the state was getting organized, Sacramento was conveniently located halfway between the gold mines and the port of San Francisco.
Oh, I read the OP wrong, then. If we are talking about why all the officers are from NorCal, well, it’s because we’re smarter. 
Because nobody’s really from southern California; they all just moved here.
In a quick search, former governors Arnold Schwarzenegger, Gray Davis, Pete Wilson, and George Deukmejian were all from SoCal. I didn’t look at the other offices, but I suspect it’s just happenstance that they’re aligning.
Hey, I’m in SoCal. I’m a native. And I’m OLD.
I was staying with friend in Vallejo years ago and went to Benicia for the day. There’s a “state capital” building there, because Benicia was the state capital for a little while. Cool little town.
You can tell by the accent.
Vallejo and San Jose also did brief stints as the capital before it settled in Sacramento. Benicia is the only one that managed to save a historic building.
It’s so good, I haven’t left there in a week. Well, that, and the whole “shelter in place” thing. 
Actually, Benicia does have a “Shelter in Place” siren that gets tested the first Wednesday of each month; it’s there in case there’s an, er, “accidental discharge” at the city’s Valero Oil refinery, and this is a real shelter in place - get inside, close the windows, that sort of thing.
but since then it’s been Jerry Brown, Newsom,
I’m amazed how many posters did not actually READ my question
Oh, I read it. I just didn’t understand it.
You did ask about “offices,” not “officeholders.”
I read that Monterey used to be the capital of California, or at least the governor-general resided there. Things rapidly changed after the Gold Rush, of course.
Two instances really aren’t enough to judge by. Small sample sizes are the death of understanding.
Jerry Brown’s first political office was in Los Angeles County. I voted for him then, and in every other race he ran except for mayor of Oakland because I was elsewhere then.
True, Jerry was born in San Francisco, and more than a few of the state’s officers were also linked to The City and environs: Willie Brown, the last few US Senators, as well as some influential US Reps. I’ll credit luck (for Feinstein, prominent only after a double assassination) and vicious Bay Area politics with its Darwinian competition. Los Angeles and San Diego pols can get away with sloppiness that’s not survivable up north.
Monterey was the capitol and port of entry for Alta California. Then the US military occupation started a few years before the 49er Gold Rush; the capitol was quickly moved to San Jose, then Vallejo and Benecia, and finally Sacratomato. Now Monterey is only the language capitol of the world.
For a long time everything was concentrated around the greater Bay Area–population, most higher education, banking, and, of course, politics.
Take UC for example. Today we think of it as Berkeley plus nine other campuses each offering a comprehensive university curriculum, and a few of those campuses have attained international renown in their own right. But until about 1950 there was really just Berkeley plus various specialized facilities up and down the state, e.g. an oceanography institute in La Jolla, a citrus experiment station in Riverside, and so on. UCLA was essentially a teachers’ college until about 1940. For reasons that made sense at the time, the uni administration in Berkeley wanted to keep it that way. After all, most state universities around the country operated in a similar manner.
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