Finding the Spades
Two of Spades: The Two of Spades is located about halfway between Chongju and the Yongbyon Reactors, in the mountains to the south of the road (the path is marked by a large set of rocks), a bit north of the 91 marker on your map. She's got a pair of SAM vehicles nearby, as well as a couple of attack choppers, making this a difficult extraction for anyone going in by air; calling for a K200 drop and heading in on the ground is a better idea. Shoot down the choppers, take out any soldiers nearby, then start up the path to the Two, but be careful: one of the turrets here shoots grenades, which can blow you away without a problem.
When you get close to the Two, pop out of your car and subdue her, then finish off any remaining soldiers and the SAM vehicles before calling for a pickup. The area isn't likely to be suitable for evac, so you might need to drag her down the road a way.
Three of Spades: The Three of Spades, like the Six, is located in the hills to the southwest of the Chemical Complex; in order to effectively take her out, you'll almost certainly need to be in a North Korean helicopter with a North Korean disguise on, because there's a ton of NK SAM vehicles in the hills around her location. She's right near the 153 marker on your map, but she's on the top of a little hill with no road access, meaning that you can't even see her from the ground, and won't be able to verify her without some kind of helicopter to your name. We say verify because capping her alive will either entail using Tank Busters to take down all of the AA vehicles, or somehow carrying her body down to the valley below and finding a vehicle to drive away in. Better yet, you can just leave her be and not bother capturing or killing her, as getting in and out will entail a lot more trouble than the $100,000 prize warrants.
Four of Spades: The Four is located just to the north of Unsan Village, on a little plateau high up in the mountains. You can't get to her without a helicopter, which makes approaching tricky, since she has an anti-air launcher... yeah. The easiest thing to do here is to just buy a Korean assault chopper, fly around until you're disguised as a North Korean, then land on her plateau, pop out, and subdue her. You can also just kill her from the air before landing and verifying; it's up to you.
Five of Spades: The Five is located just to the east of the Tenement Ruins, in a small valley that's mostly inaccessible to ground vehicles. It's possible that you might find some kind of mountain path that leads to her position, but you're better off just going in with a helicopter. Now, getting the Five alive is going to be really difficult, considering that she's squatting right next to a bunker that will spit out flak tanks and BMP APCs faster than you can destroy them; getting her alive will entail either knocking her out, then destroying the bunker (a task unto itself), or loading her into a vehicle and driving away until you can find a suitable evac spot. We preferred to just kill, verify, then run or medivac out of town, but the choice is up to you.
Six of Spades: The Six is south of the Chemical Complex, in a small complex to the west of the road leading up to the Complex itself. She's guarded by a lot of troops, a tank, and what appears to be some kind of stolen Allied APC. There's a troop bunker here, so getting her out alive might be difficult unless you can destroy it; there are also numerous North Korean vehicles on the road, though, so you might just want to try jacking a Sungri Scout and using that to transport her farther to the south before calling for an evac.