Who is the most popular member? and least popular member?

I got it!! here it is, its the newest ranking

The Most popular Ranking in Korea
1. Kim Taeyeon
2. Im Yoon-Ah
3. Seo Joo Hyun
4. Jessica Jung
5. Tiffany Hwang
6. Kwon Yuri
7. Choi Sooyoung
8. Lee Sunkyu
9. Kim Hyoyeon

The Most popular Ranking in Youtube
1. Jessica
2. Tiffany
3. Taeyeon
4. Yoona
5. Seohyun
6. Sooyoung
7. Yuri
8. Sunny
9. Hyoyeon

The Most popular Ranking in Japan
1. Im Yoon-Ah
2. Kim Taeyeon
3. Choi Sooyoung
4. Jessica Jung
5. Tiffany Hwang
6. Lee Sunkyu
7. Seo Joo Hyun
8. Kwon Yuri
9. Kim Hyoyeon

The Most popular Ranking in Europe
1. Kim Hyoyeon
2. Choi Sooyoung
3. Lee Sunkyu
4. Jessica Jung
5. Im YoonA
6. Seo Joo Hyun
7. Tiffany Hwang
8. Kim Taeyeon
9. Kwon Yuri

The Most popular Ranking in America
1. Choi Sooyoung
2. Lee Sunkyu
3. Kim Hyoyeon
4. Kwon Yuri
5. Kim Taeyeon
6. Im YoonA
7. Tiffany Hwang
8. Jessica Jung
9. Seo Joo Hyun

cr : Girls' Generation (SNSD) link

another link --> link

BONUS..

Most popular Couple in SNSD

1.YoonYul (Yoona & Yuri) (25.1%, 693 Votes)
2.TaeNy (Taeyeon & Tiffany ) (18.4%, 507 Votes)
3.SunYeon (Sunny & Taeyeon) (11.3%, 312 Votes)
4.JeTi (Jessica & Tiffany) (8.5%, 235 Votes)
5.YulSic (Yuri & Jessica) (8.3%, 228 Votes)
6.YoonSic (Yoona & Jessica) (7.5%, 207 Votes)
7.SooNa (Sooyoung & Yoona) (5.2%, 142 Votes)
8.YulTi (Yuri & Tiffany) (3.8%, 105 Votes)
9.SooRi (Sooyoung & Yuri) (3.7%, 103 Votes)
10.HyoSic (Hyoyeon & Jessica) (3.1%, 84 Votes)
11.SooFany (Sooyoung & Tiffany) (2.6%, 72 Votes)
12.SooSic (Sooyoung and Jessica) (2.5%, 69 Votes)

Total Voters: 2,758

cr: korea.com

link --> link

i'm doing a GENERAL list, based from what i see on popularity polls

Asia(except Japan)
1-Yoona
2-Taeyeon
3-Jessica
4-Yuri
5-Tiffany
6-Seohyun
7-Sunny
8-Sooyoung
9-Hyoyeon

America
1-Sooyoung
2-Hyoyeon
3-Sunny
4-Tiffany
5-Jessica
6-Taeyeon
7-Yuri
8-Yoona
9-Seohyun

Europe
1-Hyoyeon
2-Sooyoung/Sunny
3-Tiffany

it's hard to rank the others

Well its hard to say as far as ranking goes because official encuestas and personal encuestas say different things. tu really don't know.

For example.
this is the lista that was made for Popularity ranking for SNSD in Japan:
- The Most popular Ranking in Japan
link:link

1. Im Yoon-Ah

2. Kim Taeyeon

3. Choi Sooyoung

4. Jessica Jung

5. Tiffany Hwang

6. Lee Sunkyu

7. Seo Joo Hyun

8. Kwon Yuri

9. Kim Hyoyeon

However if tu look at the popularity for ALL kpop idol in Japan.
[TOP 100] K-Pop Idol Group’s Members Popularity Ranking in Japan:
link:link

14th-Yoona

15th-Sunny

23th-Taeyeon

56th-Jessica

76th-Tiffany

81th-Sooyoung

82th-Soehyun

Now in Korea it is also interesting because most lista will follow this kind o order

1.Yoona
2.Taeyeon
3.Tiffany
4.Yuri
6.Seohyun
7.Jessica
8.Sooyoung
9.Sunny
11.Hyoyeon

now this came from a lista of parte superior, arriba 100 kpop Idol Stars
link:link

which is very different from what we may normally see
1. Kim Taeyeon
2. Im Yoon-Ah
3. Seo Joo Hyun
4. Jessica Jung
5. Tiffany Hwang
6. Kwon Yuri
7. Choi Sooyoung
8. Lee Sunkyu
9. Kim Hyoyeon

link:link:link

The point is the the only thing we can know for sure if that for most popular it can be either Yoona o Taeyeon, for least popular it can be Hyoyeon o Sunny. Everything in the middle we can really know for sure because not every encuesta gives out the same ranking aside from the most popular and the least popular.

1.Yoona
2.Jessica
3.Taeyeon
4.Seohyun
5.Tiffany
6.Yuri
7.Sooyoung
8.Hyoyeon
9.Sunny

Most:Yoona o Taeyeon
Least:Sunny o Hyoyeon

TAEYEON, SEOHYUN, YOONA/FANY, SICA, SOOYOUNG, YUL, SUNNY, HYOHEON

.. Seohyun popularity is no joke.. it looks like she's like yoona now who has many anti's also.. im soo sad since she's my bias.. after she appeared in we got married with yonghwa, she became very popular and also being in a sub group, she became very well-known.. and for sica and yul , they are also popular but yul looks like she is not really that popular compare to Genie era.. and sica also very popular but not as much as the taetiseo and yoona.. (it is just my opinion)

Well where I LIVE this is how it is:
1. Hyoyeon
2. Taeyeon
3. Yuri
4. Jessica
5. Yoona
6. Tiffany
7. Sunny
8. Sooyoung
9. Seohyun

For My own Opinion please No BASH!
1.TaeYeon
2. YoonA
3. SeoHyun
4. Jessica
5. Tiffany
6. Yuri
7. SunNy
8. Sooyoung
9. Hyoyeon

tu know its funny cause to me it was always so different.

Remember, I'm replying in 2020 and I do not watch any Kdrama o K-series, I only watched a few shows and funny videos around 5 years hace so my view towards them is very different.
My order is:
1. Tiffany
2. Jessica
3. Sooyoung
4. Tae
5. Sunny
6. Yuri
7. Yoona
8. Seohyun
9. Hyoyeon

This is just me, I am from Brazil and lived in the US for 6 years and met SNSD while living in the US but didn't really have any friends that were into kpop at the time.

I used to really stan Jessica but then she left the group and tiffany was always a close second. Then while watching some youtube for the past año o two I saw a few videos of Tiffany in the US, tu know promoting her solo career.

they are all great but tu know, preference.