This was a few days ago, but it's still interesting.
Census estimates:
Current Estimates Data
The Oregonian
made a county-by-county map of the results.
Here's a text list for people's convenience, ranked by percentage gain or loss over 2011:
County (County seat): 2012 estimated population (2011 estimate). Change: +/- Raw number (percentage change)
1. Washington (Hillsboro): 547,672 (539,464). Change: +8,208 (1.522%)
2. Multnomah (Portland): 759,256 (748,091). Change: +11,165 (1.492%)
3. Deschutes (Bend): 162,277 (160,083). Change: +2,194 (1.371%)
4. Wasco (The Dalles): 25,487 (25,228). Change: +259 (1.027%)
5. Clackamas (Oregon City): 383,857 (379,984). Change: +3,873 (1.019%)
6. Jackson (Medford): 206,412 (204,718). Change: +1,694 (0.827%)
7. Hood River (Hood River): 22,584 (22,414). Change: +170 (0.758%)
8. Marion (Salem): 319,985 (317,826). Change: +2,159 (0.679%)
9. Lincoln (Newport): 46,151 (45,885). Change: +266 (0.58%)
10. Morrow (Heppner): 11,244 (11,181). Change: +63 (0.563%)
11. Benton (Corvallis): 86,430 (86,006). Change: +424 (0.493%)
12. Polk (Dallas): 76,353 (75,996). Change: +357 (0.47%)
13. Yamhill (McMinnville): 100,255 (99,800). Change: +455 (0.456%)
14. Wheeler (Fossil): 1,424 (1,419). Change: +5 (0.352%)
15. Clatsop (Astoria): 37,301 (37,171). Change: +130 (0.35%)
16. Crook (Prineville): 20,729 (20,662). Change: +67 (0.324%)
17. Josephine (Grants Pass): 82,930 (82,680). Change: +250 (0.302%)
18. Lane (Eugene): 354,542 (353,481). Change: +1,081 (0.3%)
19. Jefferson (Madras): 21,749 (21,686). Change: +63 (0.291%)
20. Umatilla (Pendleton): 76,820 (76,668). Change: +152 (0.198%)
21. Linn (Albany): 118,360 (118,135). Change: +255 (0.19%)
22. Gilliam (Condon): 1,953. Unchanged. (0%)
23. Union (La Grande): 25,759 (25,775). Change: -16 (-0.062%)
24. Sherman (Moro): 1,732 (1,734). Change: -2 (-0.115%)
25. Columbia (Saint Helens): 49,286 (49,357). Change: -71 (-0.144%)
26. Douglas (Roseburg): 107,164 (107,400). Change: -236 (-0.22%)
27. Tilllamook (Tillamook): 25,287 (25,389). Change: -102 (-0.402%)
28. Malheur (Vale): 30,630 (30,757). Change: -127 (-0.413%)
29. Coos (Coquille): 62,534 (62,795). Change: -261 (-0.416%)
30. Klamath (Klamath Falls): 65,912 (66,296). Change: -384 (-0.579%)
31. Baker (Baker City): 15,909 (16,040). Change: -131 (-0.817%)
32. Curry (Gold Beach): 22,248 (22,462). Change: -214 (-0.953%)
33. Grant (Canyon City): 7,317 (7,410). Change: -93 (-1.255%)
34. Lake (Lakeview): 7,771 (7,920). Change: -149 (-1.881%)
35. Harney (Burns): 7,212 (7,368). Change: -156 (-2.117%)
36. Wallowa (Enterprise): 6,821 (6,995). Change: -174 (-2.487%)
...
Oregon: 3,899,353 (3,871,859). Change: +27,494 (0.8%). Rank: #27 among states and territories, or 1.22% of the US population.
...
On the Washington side - Oregon border counties:
Clark (Vancouver): 438,287 (433,115). Change: +5,172 (1.19%)
Benton (Prosser): 182,398 (180,542). Change: +1,856 (1.082%)
Skamania (Stevenson): 11,187 (11,117). Change: +70 (0.63%)
Asotin (Asotin): 21,888 (21,899). Change: -11 (-0.05%)
Klickitat (Goldendale): 20,699 (20,714). Change: -15 (-0.072%)
Walla Walla (Walla Walla): 59,404 (59,483). Change: -79 (-0.133%)
Cowlitz (Kelso): 101,996 (102,431). Change: -435 (-0.425%)
Columbia (Dayton): 3,995 (4,017). Change: -22 (-0.548)
Wahkiakum (Cathlamet): 3,993 (4,023). Change: -30 (-0.746%)
Garfield (Pomeroy): 2,228 (2,252). Change: -24 (-1.066%)
Pacific (South Bend): 20,575 (20,910). Change: -335 (-1.602%)
...
Washington: 6,897,012 (6,830,038). Change: +66,974 (0.981%). Rank: #13 among states and territories, or 2.15% of the US population.
...
On the California side - Oregon border counties:
Del Norte (Crescent City): 28,290 (28,513). Change: -223 (-0.782%)
Siskiyou (Yreka): 44,154 (44,680). Change: -526 (-1.177%)
Modoc (Alturas): 9,327 (9,495). Change: -168 (-1.769%)
...
California: 38,041,430 (37,691,912). Change: +349,518 (0.927%). Rank: #1 among states and territories, or 11.91% of the US population.
...
On the Idaho side - Oregon border counties:
Canyon (Caldwell): 193,888 (191,367). Change: +2,521 (1.317%)
Payette (Payette): 22,639 (22,514). Change: +125 (0.555%)
Nez Perce (Lewiston): 39,531 (39,428). Change: +103 (0.261%)
Owyhee (Murphy): 11,439 (11,416). Change: +23 (0.201%)
Washington (Weiser): 10,099 (10,156). Change: -57 (-0.561)
Idaho (Grangeville): 16,308 (16,450). Change: -142 (-0.863%)
Adams (Council): 3,915 (3,990). Change: -75 (-1.88%)
...
Idaho: 1,595,728 (1,584,985). Change: +10,743 (0.678%). Rank: #40 among states and territories, or 0.51% of the US population.
...
On the Nevada side - Oregon border counties:
Elko (Elko): 51,216 (49,441). Change: +1,775 (3.59%)
Humboldt (Winnemucca): 17,048 (16,653). Change: +395 (2.372%)
Washoe (Reno): 429,908 (425,400). Change: +4,508 (1.06%)
...
Nevada: 2,758,931 (2,723,322). Change: +35,609 (1.308%). Rank: #36 among states and territories, or 0.86% of the US population.
...
United States: 313,914,040 (311,591,917). Change: +2,322,123 (0.745%). Rank: #3 globally, or 4.438% of the global population.